diff --git a/plugins/layout/init.lua b/plugins/layout/init.lua
index 45b810c86b7..bcb374b8e67 100644
--- a/plugins/layout/init.lua
+++ b/plugins/layout/init.lua
@@ -28,6 +28,7 @@ function layout.startplugin()
 			pairs = pairs,
 			ipairs = ipairs,
 			string = { format = string.format },
+			tostring = tostring,
 			table = { insert = table.insert, remove = table.remove } }
 		local script, err = load(script, script, "t", env)
 		if not script then
diff --git a/src/mame/chess/ave_arb.cpp b/src/mame/chess/ave_arb.cpp
index f7fcdcd8b17..840df91ec51 100644
--- a/src/mame/chess/ave_arb.cpp
+++ b/src/mame/chess/ave_arb.cpp
@@ -279,7 +279,7 @@ static INPUT_PORTS_START( arb )
 	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_R) PORT_CODE(KEYCODE_F1) PORT_NAME("Reset") PORT_CHANGED_MEMBER(DEVICE_SELF, arb_state, reset_button, 0)
 	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_T) PORT_CODE(KEYCODE_F1) PORT_NAME("Halt") PORT_CHANGED_MEMBER(DEVICE_SELF, arb_state, halt_button, 0)
 
-	PORT_START("LISTEN") // helper for internal artwork
+	PORT_START("CLICKABLE") // helper for clickable artwork
 	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_OTHER)
 INPUT_PORTS_END
 
diff --git a/src/mame/ddr/chessmst.cpp b/src/mame/ddr/chessmst.cpp
index 937885bc43e..d9655463f12 100644
--- a/src/mame/ddr/chessmst.cpp
+++ b/src/mame/ddr/chessmst.cpp
@@ -207,7 +207,7 @@ static INPUT_PORTS_START( chessmst )
 	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Halt")  PORT_CODE(KEYCODE_F2) PORT_CHANGED_MEMBER(DEVICE_SELF, chessmst_state, halt_button, 0)
 	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Reset") PORT_CODE(KEYCODE_F1) PORT_CHANGED_MEMBER(DEVICE_SELF, chessmst_state, reset_button, 0)
 
-	PORT_START("LISTEN") // helper for internal artwork
+	PORT_START("CLICKABLE") // helper for clickable artwork
 	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_OTHER)
 INPUT_PORTS_END
 
diff --git a/src/mame/ddr/chessmstdm.cpp b/src/mame/ddr/chessmstdm.cpp
index cfd35aac723..fe60781591d 100644
--- a/src/mame/ddr/chessmstdm.cpp
+++ b/src/mame/ddr/chessmstdm.cpp
@@ -272,6 +272,9 @@ static INPUT_PORTS_START( chessmstdm )
 	PORT_START("IN.1")
 	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Monitor") PORT_CODE(KEYCODE_F1) PORT_CHANGED_MEMBER(DEVICE_SELF, chessmstdm_state, monitor_button, 0)
 	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("View")    PORT_CODE(KEYCODE_F2) PORT_CHANGED_MEMBER(DEVICE_SELF, chessmstdm_state, view_button, 0)
+
+	PORT_START("CLICKABLE") // helper for clickable artwork
+	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_OTHER)
 INPUT_PORTS_END
 
 
diff --git a/src/mame/hegenerglaser/academy.cpp b/src/mame/hegenerglaser/academy.cpp
index 439caff2368..489df6b120b 100644
--- a/src/mame/hegenerglaser/academy.cpp
+++ b/src/mame/hegenerglaser/academy.cpp
@@ -116,6 +116,9 @@ static INPUT_PORTS_START( academy )
 	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD)    PORT_NAME("FCT")    PORT_CODE(KEYCODE_F)
 	PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYPAD)    PORT_NAME("ENT")    PORT_CODE(KEYCODE_ENTER) PORT_CODE(KEYCODE_F1) // combine for NEW GAME
 	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD)    PORT_NAME("CL")     PORT_CODE(KEYCODE_BACKSPACE) PORT_CODE(KEYCODE_DEL) PORT_CODE(KEYCODE_F1) // "
+
+	PORT_START("CLICKABLE") // helper for clickable artwork
+	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_OTHER)
 INPUT_PORTS_END
 
 
diff --git a/src/mame/hegenerglaser/amsterdam.cpp b/src/mame/hegenerglaser/amsterdam.cpp
index d8cbdba3a42..0bca6e79847 100644
--- a/src/mame/hegenerglaser/amsterdam.cpp
+++ b/src/mame/hegenerglaser/amsterdam.cpp
@@ -150,28 +150,31 @@ void amsterdam_state::dallas32_mem(address_map &map)
 
 static INPUT_PORTS_START( amsterdam )
 	PORT_START("KEY.0")
-	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("INFO") PORT_CODE(KEYCODE_I)
-	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("POS") PORT_CODE(KEYCODE_O)
-	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("LEV") PORT_CODE(KEYCODE_L)
-	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("MEM") PORT_CODE(KEYCODE_M)
-	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("CL") PORT_CODE(KEYCODE_BACKSPACE) PORT_CODE(KEYCODE_DEL)
-	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("ENT") PORT_CODE(KEYCODE_ENTER) PORT_CODE(KEYCODE_ENTER_PAD)
-	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("G / 7 / King") PORT_CODE(KEYCODE_G) PORT_CODE(KEYCODE_7) PORT_CODE(KEYCODE_7_PAD)
-	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("H / 8") PORT_CODE(KEYCODE_H) PORT_CODE(KEYCODE_8) PORT_CODE(KEYCODE_8_PAD)
+	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("INFO") PORT_CODE(KEYCODE_I)
+	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("POS") PORT_CODE(KEYCODE_O)
+	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("LEV") PORT_CODE(KEYCODE_L)
+	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("MEM") PORT_CODE(KEYCODE_M)
+	PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("CL") PORT_CODE(KEYCODE_BACKSPACE) PORT_CODE(KEYCODE_DEL)
+	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("ENT") PORT_CODE(KEYCODE_ENTER) PORT_CODE(KEYCODE_ENTER_PAD)
+	PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("G / 7 / King") PORT_CODE(KEYCODE_G) PORT_CODE(KEYCODE_7) PORT_CODE(KEYCODE_7_PAD)
+	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("H / 8") PORT_CODE(KEYCODE_H) PORT_CODE(KEYCODE_8) PORT_CODE(KEYCODE_8_PAD)
 
 	PORT_START("KEY.1")
-	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("A / 1") PORT_CODE(KEYCODE_A) PORT_CODE(KEYCODE_1) PORT_CODE(KEYCODE_1_PAD)
-	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("B / 2 / Pawn") PORT_CODE(KEYCODE_B) PORT_CODE(KEYCODE_2) PORT_CODE(KEYCODE_2_PAD)
-	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("C / 3 / Knight") PORT_CODE(KEYCODE_C) PORT_CODE(KEYCODE_3) PORT_CODE(KEYCODE_3_PAD)
-	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("D / 4 / Bishop") PORT_CODE(KEYCODE_D) PORT_CODE(KEYCODE_4) PORT_CODE(KEYCODE_4_PAD)
-	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("E / 5 / Rook") PORT_CODE(KEYCODE_E) PORT_CODE(KEYCODE_5) PORT_CODE(KEYCODE_5_PAD)
-	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("F / 6 / Queen") PORT_CODE(KEYCODE_F) PORT_CODE(KEYCODE_6) PORT_CODE(KEYCODE_6_PAD)
-	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Left / Black / 9") PORT_CODE(KEYCODE_9) PORT_CODE(KEYCODE_9_PAD) PORT_CODE(KEYCODE_LEFT)
-	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Right / White / 0") PORT_CODE(KEYCODE_0) PORT_CODE(KEYCODE_0_PAD) PORT_CODE(KEYCODE_RIGHT)
+	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("A / 1") PORT_CODE(KEYCODE_A) PORT_CODE(KEYCODE_1) PORT_CODE(KEYCODE_1_PAD)
+	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("B / 2 / Pawn") PORT_CODE(KEYCODE_B) PORT_CODE(KEYCODE_2) PORT_CODE(KEYCODE_2_PAD)
+	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("C / 3 / Knight") PORT_CODE(KEYCODE_C) PORT_CODE(KEYCODE_3) PORT_CODE(KEYCODE_3_PAD)
+	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("D / 4 / Bishop") PORT_CODE(KEYCODE_D) PORT_CODE(KEYCODE_4) PORT_CODE(KEYCODE_4_PAD)
+	PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("E / 5 / Rook") PORT_CODE(KEYCODE_E) PORT_CODE(KEYCODE_5) PORT_CODE(KEYCODE_5_PAD)
+	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("F / 6 / Queen") PORT_CODE(KEYCODE_F) PORT_CODE(KEYCODE_6) PORT_CODE(KEYCODE_6_PAD)
+	PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Left / Black / 9") PORT_CODE(KEYCODE_9) PORT_CODE(KEYCODE_9_PAD) PORT_CODE(KEYCODE_LEFT)
+	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Right / White / 0") PORT_CODE(KEYCODE_0) PORT_CODE(KEYCODE_0_PAD) PORT_CODE(KEYCODE_RIGHT)
 
 	PORT_START("RESET")
 	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("RES 1") PORT_CODE(KEYCODE_Z) PORT_CODE(KEYCODE_F1) PORT_CHANGED_MEMBER(DEVICE_SELF, amsterdam_state, reset_button, 0)
 	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("RES 2") PORT_CODE(KEYCODE_X) PORT_CODE(KEYCODE_F1) PORT_CHANGED_MEMBER(DEVICE_SELF, amsterdam_state, reset_button, 0)
+
+	PORT_START("CLICKABLE") // helper for clickable artwork
+	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_OTHER)
 INPUT_PORTS_END
 
 
diff --git a/src/mame/hegenerglaser/berlin.cpp b/src/mame/hegenerglaser/berlin.cpp
index 5a1d32073e8..93e2725167f 100644
--- a/src/mame/hegenerglaser/berlin.cpp
+++ b/src/mame/hegenerglaser/berlin.cpp
@@ -116,6 +116,9 @@ static INPUT_PORTS_START( berlin )
 	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD)    PORT_NAME("Right")           PORT_CODE(KEYCODE_RIGHT)
 	PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYPAD)    PORT_NAME("New Game (1/2)")  PORT_CODE(KEYCODE_1) PORT_CODE(KEYCODE_F1) // combine for NEW GAME
 	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD)    PORT_NAME("New Game (2/2)")  PORT_CODE(KEYCODE_2) PORT_CODE(KEYCODE_F1) // "
+
+	PORT_START("CLICKABLE") // helper for clickable artwork
+	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_OTHER)
 INPUT_PORTS_END
 
 
diff --git a/src/mame/hegenerglaser/milano.cpp b/src/mame/hegenerglaser/milano.cpp
index 3523bb4b67c..cb8edd5ad37 100644
--- a/src/mame/hegenerglaser/milano.cpp
+++ b/src/mame/hegenerglaser/milano.cpp
@@ -151,6 +151,9 @@ static INPUT_PORTS_START( milano )
 	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD)    PORT_NAME("Function / King")   PORT_CODE(KEYCODE_F)
 	PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYPAD)    PORT_NAME("Enter / New Game")  PORT_CODE(KEYCODE_ENTER) PORT_CODE(KEYCODE_F1) // combine for NEW GAME
 	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD)    PORT_NAME("Clear / New Game")  PORT_CODE(KEYCODE_BACKSPACE) PORT_CODE(KEYCODE_DEL) PORT_CODE(KEYCODE_F1) // "
+
+	PORT_START("CLICKABLE") // helper for clickable artwork
+	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_OTHER)
 INPUT_PORTS_END
 
 
diff --git a/src/mame/hegenerglaser/mm2.cpp b/src/mame/hegenerglaser/mm2.cpp
index ac10802d2b4..cddeea56d24 100644
--- a/src/mame/hegenerglaser/mm2.cpp
+++ b/src/mame/hegenerglaser/mm2.cpp
@@ -277,6 +277,9 @@ static INPUT_PORTS_START( mm2 )
 	PORT_START("RESET")
 	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("RES 1") PORT_CODE(KEYCODE_Z) PORT_CODE(KEYCODE_F1) PORT_CHANGED_MEMBER(DEVICE_SELF, mm2_state, reset_button, 0)
 	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("RES 2") PORT_CODE(KEYCODE_X) PORT_CODE(KEYCODE_F1) PORT_CHANGED_MEMBER(DEVICE_SELF, mm2_state, reset_button, 0)
+
+	PORT_START("CLICKABLE") // helper for clickable artwork
+	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_OTHER)
 INPUT_PORTS_END
 
 static INPUT_PORTS_START( bup )
@@ -303,6 +306,9 @@ static INPUT_PORTS_START( bup )
 	PORT_START("RESET")
 	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("RES 1") PORT_CODE(KEYCODE_Z) PORT_CODE(KEYCODE_F1) PORT_CHANGED_MEMBER(DEVICE_SELF, mm2_state, reset_button, 0)
 	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("RES 2") PORT_CODE(KEYCODE_X) PORT_CODE(KEYCODE_F1) PORT_CHANGED_MEMBER(DEVICE_SELF, mm2_state, reset_button, 0)
+
+	PORT_START("CLICKABLE") // helper for clickable artwork
+	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_OTHER)
 INPUT_PORTS_END
 
 
diff --git a/src/mame/hegenerglaser/modena.cpp b/src/mame/hegenerglaser/modena.cpp
index f221f9e1714..be0e59f1b0e 100644
--- a/src/mame/hegenerglaser/modena.cpp
+++ b/src/mame/hegenerglaser/modena.cpp
@@ -159,6 +159,9 @@ static INPUT_PORTS_START( modena )
 	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD)    PORT_NAME("Function / King")   PORT_CODE(KEYCODE_F)
 	PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYPAD)    PORT_NAME("Enter / New Game")  PORT_CODE(KEYCODE_ENTER) PORT_CODE(KEYCODE_F1) // combine for NEW GAME
 	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD)    PORT_NAME("Clear / New Game")  PORT_CODE(KEYCODE_BACKSPACE) PORT_CODE(KEYCODE_DEL) PORT_CODE(KEYCODE_F1) // "
+
+	PORT_START("CLICKABLE") // helper for clickable artwork
+	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_OTHER)
 INPUT_PORTS_END
 
 
diff --git a/src/mame/hegenerglaser/mondial68k.cpp b/src/mame/hegenerglaser/mondial68k.cpp
index fb4116b8bef..36f228fa1de 100644
--- a/src/mame/hegenerglaser/mondial68k.cpp
+++ b/src/mame/hegenerglaser/mondial68k.cpp
@@ -153,28 +153,31 @@ void mondial68k_state::mondial68k_mem(address_map &map)
 
 static INPUT_PORTS_START( mondial68k )
 	PORT_START("IN.0")
-	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("A / 1") PORT_CODE(KEYCODE_A) PORT_CODE(KEYCODE_1) PORT_CODE(KEYCODE_1_PAD)
-	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("E / 5 / Rook") PORT_CODE(KEYCODE_E) PORT_CODE(KEYCODE_5) PORT_CODE(KEYCODE_5_PAD)
-	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Left / Black / 9") PORT_CODE(KEYCODE_9) PORT_CODE(KEYCODE_9_PAD) PORT_CODE(KEYCODE_LEFT)
-	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("LEV") PORT_CODE(KEYCODE_L)
+	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("A / 1") PORT_CODE(KEYCODE_A) PORT_CODE(KEYCODE_1) PORT_CODE(KEYCODE_1_PAD)
+	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("E / 5 / Rook") PORT_CODE(KEYCODE_E) PORT_CODE(KEYCODE_5) PORT_CODE(KEYCODE_5_PAD)
+	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Left / Black / 9") PORT_CODE(KEYCODE_9) PORT_CODE(KEYCODE_9_PAD) PORT_CODE(KEYCODE_LEFT)
+	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("LEV") PORT_CODE(KEYCODE_L)
 
 	PORT_START("IN.1")
-	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("B / 2 / Pawn") PORT_CODE(KEYCODE_B) PORT_CODE(KEYCODE_2) PORT_CODE(KEYCODE_2_PAD)
-	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("F / 6 / Queen") PORT_CODE(KEYCODE_F) PORT_CODE(KEYCODE_6) PORT_CODE(KEYCODE_6_PAD)
-	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Right / White / 0") PORT_CODE(KEYCODE_0) PORT_CODE(KEYCODE_0_PAD) PORT_CODE(KEYCODE_RIGHT)
-	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("MEM") PORT_CODE(KEYCODE_M)
+	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("B / 2 / Pawn") PORT_CODE(KEYCODE_B) PORT_CODE(KEYCODE_2) PORT_CODE(KEYCODE_2_PAD)
+	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("F / 6 / Queen") PORT_CODE(KEYCODE_F) PORT_CODE(KEYCODE_6) PORT_CODE(KEYCODE_6_PAD)
+	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Right / White / 0") PORT_CODE(KEYCODE_0) PORT_CODE(KEYCODE_0_PAD) PORT_CODE(KEYCODE_RIGHT)
+	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("MEM") PORT_CODE(KEYCODE_M)
 
 	PORT_START("IN.2")
-	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("C / 3 / Knight") PORT_CODE(KEYCODE_C) PORT_CODE(KEYCODE_3) PORT_CODE(KEYCODE_3_PAD)
-	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("G / 7 / King") PORT_CODE(KEYCODE_G) PORT_CODE(KEYCODE_7) PORT_CODE(KEYCODE_7_PAD)
-	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("INFO") PORT_CODE(KEYCODE_I)
-	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("CL") PORT_CODE(KEYCODE_BACKSPACE) PORT_CODE(KEYCODE_DEL)
+	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("C / 3 / Knight") PORT_CODE(KEYCODE_C) PORT_CODE(KEYCODE_3) PORT_CODE(KEYCODE_3_PAD)
+	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("G / 7 / King") PORT_CODE(KEYCODE_G) PORT_CODE(KEYCODE_7) PORT_CODE(KEYCODE_7_PAD)
+	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("INFO") PORT_CODE(KEYCODE_I)
+	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("CL") PORT_CODE(KEYCODE_BACKSPACE) PORT_CODE(KEYCODE_DEL) PORT_CODE(KEYCODE_F1) // combine ENT/CL for NEW GAME
 
 	PORT_START("IN.3")
-	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("D / 4 / Bishop") PORT_CODE(KEYCODE_D) PORT_CODE(KEYCODE_4) PORT_CODE(KEYCODE_4_PAD)
-	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("H / 8") PORT_CODE(KEYCODE_H) PORT_CODE(KEYCODE_8) PORT_CODE(KEYCODE_8_PAD)
-	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("POS") PORT_CODE(KEYCODE_O)
-	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("ENT") PORT_CODE(KEYCODE_ENTER) PORT_CODE(KEYCODE_ENTER_PAD)
+	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("D / 4 / Bishop") PORT_CODE(KEYCODE_D) PORT_CODE(KEYCODE_4) PORT_CODE(KEYCODE_4_PAD)
+	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("H / 8") PORT_CODE(KEYCODE_H) PORT_CODE(KEYCODE_8) PORT_CODE(KEYCODE_8_PAD)
+	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("POS") PORT_CODE(KEYCODE_O)
+	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("ENT") PORT_CODE(KEYCODE_ENTER) PORT_CODE(KEYCODE_ENTER_PAD) PORT_CODE(KEYCODE_F1) // combine ENT/CL for NEW GAME
+
+	PORT_START("CLICKABLE") // helper for clickable artwork
+	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_OTHER)
 INPUT_PORTS_END
 
 
diff --git a/src/mame/hegenerglaser/polgar.cpp b/src/mame/hegenerglaser/polgar.cpp
index 5cd97a3d795..89763ca392e 100644
--- a/src/mame/hegenerglaser/polgar.cpp
+++ b/src/mame/hegenerglaser/polgar.cpp
@@ -96,6 +96,9 @@ static INPUT_PORTS_START( polgar )
 	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD)    PORT_NAME("FCT / King")      PORT_CODE(KEYCODE_F)
 	PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYPAD)    PORT_NAME("ENT / New Game")  PORT_CODE(KEYCODE_ENTER) PORT_CODE(KEYCODE_F1) // combine for NEW GAME
 	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD)    PORT_NAME("CL / New Game")   PORT_CODE(KEYCODE_BACKSPACE) PORT_CODE(KEYCODE_DEL) PORT_CODE(KEYCODE_F1) // "
+
+	PORT_START("CLICKABLE") // helper for clickable artwork
+	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_OTHER)
 INPUT_PORTS_END
 
 
diff --git a/src/mame/hegenerglaser/risc.cpp b/src/mame/hegenerglaser/risc.cpp
index 1e20f5284e9..3f9e8d97a1a 100644
--- a/src/mame/hegenerglaser/risc.cpp
+++ b/src/mame/hegenerglaser/risc.cpp
@@ -132,6 +132,9 @@ static INPUT_PORTS_START( mrisc )
 	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD)    PORT_NAME("FCT / King")      PORT_CODE(KEYCODE_F)
 	PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYPAD)    PORT_NAME("ENT / New Game")  PORT_CODE(KEYCODE_ENTER) PORT_CODE(KEYCODE_F1) // combine for NEW GAME
 	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD)    PORT_NAME("CL / New Game")   PORT_CODE(KEYCODE_BACKSPACE) PORT_CODE(KEYCODE_DEL) PORT_CODE(KEYCODE_F1) // "
+
+	PORT_START("CLICKABLE") // helper for clickable artwork
+	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_OTHER)
 INPUT_PORTS_END
 
 
diff --git a/src/mame/layout/ave_arb.lay b/src/mame/layout/ave_arb.lay
index a1ac4b31c60..2ac67ee7e5b 100644
--- a/src/mame/layout/ave_arb.lay
+++ b/src/mame/layout/ave_arb.lay
@@ -11,7 +11,7 @@ license:CC0
 		local prev_state = 0
 
 		function layout.frame()
-			local cur_state = machine.ioport.ports[":LISTEN"]:read() & 1
+			local cur_state = machine.ioport.ports[":CLICKABLE"]:read() & 1
 			if cur_state ~= prev_state then
 				machine.ioport.ports[":IN.1"]:field(0x01):set_value(cur_state)
 				machine.ioport.ports[":IN.1"]:field(0x02):set_value(cur_state)
@@ -569,7 +569,7 @@ license:CC0
 		<element name="9.9" ref="led2"><bounds x="91" y="60.25" width="1.5" height="1.5" /></element>
 		<element name="9.8" ref="led2"><bounds x="91" y="63.25" width="1.5" height="1.5" /></element>
 
-		<element ref="nothing" inputtag="LISTEN" inputmask="0x01"><bounds x="95" y="13" width="2" height="2" /></element>
+		<element ref="nothing" inputtag="CLICKABLE" inputmask="0x01"><bounds x="95" y="13" width="2" height="2" /></element>
 		<element ref="bt" inputtag="IN.1" inputmask="0x01"><bounds x="95" y="13" width="2" height="2" /></element>
 		<element ref="bt" inputtag="IN.1" inputmask="0x02"><bounds x="95" y="17" width="2" height="2" /></element>
 
diff --git a/src/mame/layout/chessmst.lay b/src/mame/layout/chessmst.lay
index df928af8441..f4ff7163f0d 100644
--- a/src/mame/layout/chessmst.lay
+++ b/src/mame/layout/chessmst.lay
@@ -11,7 +11,7 @@ license:CC0
 		local prev_state = 0
 
 		function layout.frame()
-			local cur_state = machine.ioport.ports[":LISTEN"]:read() & 1
+			local cur_state = machine.ioport.ports[":CLICKABLE"]:read() & 1
 			if cur_state ~= prev_state then
 				machine.ioport.ports[":IN.1"]:field(0x01):set_value(cur_state)
 				machine.ioport.ports[":IN.1"]:field(0x02):set_value(cur_state)
@@ -506,7 +506,7 @@ license:CC0
 		<element ref="hlb" inputtag="IN.0" inputmask="0x02"><bounds x="118" y="62" width="4" height="4" /></element>
 		<element ref="hlb" inputtag="IN.0" inputmask="0x01"><bounds x="118" y="69" width="4" height="4" /></element>
 
-		<element ref="nothing" inputtag="LISTEN" inputmask="0x01"><bounds x="108" y="79" width="4" height="4" /></element>
+		<element ref="nothing" inputtag="CLICKABLE" inputmask="0x01"><bounds x="108" y="79" width="4" height="4" /></element>
 		<element ref="hlb" inputtag="IN.1" inputmask="0x02"><bounds x="108" y="79" width="4" height="4" /></element>
 		<element ref="hlb" inputtag="IN.1" inputmask="0x01"><bounds x="122" y="79" width="4" height="4" /></element>
 
diff --git a/src/mame/layout/chessmstdm.lay b/src/mame/layout/chessmstdm.lay
index 28d2be5b599..6c4f932c9da 100644
--- a/src/mame/layout/chessmstdm.lay
+++ b/src/mame/layout/chessmstdm.lay
@@ -4,6 +4,25 @@ license:CC0
 -->
 <mamelayout version="2">
 
+<!-- luascript (-plugin layout), for pressing 2 buttons simultaneously -->
+
+	<script><![CDATA[
+		local layout = {}
+		local prev_state = 0
+
+		function layout.frame()
+			local cur_state = machine.ioport.ports[":CLICKABLE"]:read() & 1
+			if cur_state ~= prev_state then
+				machine.ioport.ports[":IN.1"]:field(0x01):set_value(cur_state)
+				machine.ioport.ports[":IN.1"]:field(0x02):set_value(cur_state)
+			end
+			prev_state = cur_state
+		end
+
+		return layout
+	]]></script>
+
+
 <!-- define elements -->
 
 	<element name="black_rect">
@@ -24,6 +43,7 @@ license:CC0
 			<color red="1.0" green="0.0" blue="0.0" />
 		</disk>
 	</element>
+
 	<element name="hlb" defstate="0">
 		<disk state="0">
 			<bounds x="0.0" y="0.0" width="1.0" height="1.0" />
@@ -35,6 +55,10 @@ license:CC0
 		</disk>
 	</element>
 
+	<element name="nothing" defstate="0">
+		<rect><color alpha="0" /></rect>
+	</element>
+
 	<element name="text_1"> <rect><color red="0.84" green="0.75" blue="0.50" /></rect>    <text string="1"><color red="0.01" green="0.01" blue="0.01" /></text> </element>
 	<element name="text_2"> <rect><color red="0.84" green="0.75" blue="0.50" /></rect>    <text string="2"><color red="0.01" green="0.01" blue="0.01" /></text> </element>
 	<element name="text_3"> <rect><color red="0.84" green="0.75" blue="0.50" /></rect>    <text string="3"><color red="0.01" green="0.01" blue="0.01" /></text> </element>
@@ -410,10 +434,10 @@ license:CC0
 		<element ref="text_move_fore">  <bounds x="115"  y="84"   width="12" height="2" /></element>
 		<element ref="text_playmode">   <bounds x="103"  y="74"   width="10" height="2" /></element>
 
-		<element name="8.a" ref="led"> <bounds x="110.5" y="20.63" width="1.5" height="1.5" /> </element>
-		<element name="9.a" ref="led"> <bounds x="112"   y="74.13" width="1.5" height="1.5" /> </element>
-		<element ref="black_rect"> <bounds x="119.4" y="24.2" width="0.2" height="1.6" /> </element>
-		<element ref="black_rect"> <bounds x="116.7" y="25.0" width="2.9" height="0.2" /> </element>
+		<element name="8.a" ref="led"><bounds x="110.5" y="20.63" width="1.5" height="1.5" /></element>
+		<element name="9.a" ref="led"><bounds x="112"   y="74.13" width="1.5" height="1.5" /></element>
+		<element ref="black_rect"><bounds x="119.4" y="24.2" width="0.2" height="1.6" /></element>
+		<element ref="black_rect"><bounds x="116.7" y="25.0" width="2.9" height="0.2" /></element>
 
 		<element ref="hlb" inputtag="IN.1" inputmask="0x01"><bounds x="117" y="19" width="5" height="5" /></element>
 		<element ref="hlb" inputtag="IN.1" inputmask="0x02"><bounds x="117" y="26" width="5" height="5" /></element>
@@ -426,8 +450,11 @@ license:CC0
 		<element ref="hlb" inputtag="IN.0" inputmask="0x02"><bounds x="105" y="78" width="5" height="5" /></element>
 		<element ref="hlb" inputtag="IN.0" inputmask="0x01"><bounds x="119" y="78" width="5" height="5" /></element>
 
+		<!-- hidden input at the left of MONITOR/VIEW buttons to press both -->
+		<element ref="nothing" inputtag="CLICKABLE" inputmask="0x01"><bounds x="110.8" y="24" width="5" height="2" /></element>
+
 		<!-- panel 16seg leds -->
-		<element name="display_background" ref="black_rect"> <bounds x="101" y="4" width="26" height="9.2" /> </element>
+		<element name="display_background" ref="black_rect"> <bounds x="101" y="4" width="26" height="9.2" /></element>
 		<element name="digit3" ref="digit"> <bounds x="102" y="4.5" width="5.66" height="8.5" /></element>
 		<element name="digit2" ref="digit"> <bounds x="108" y="4.5" width="5.66" height="8.5" /></element>
 		<element name="digit1" ref="digit"> <bounds x="114" y="4.5" width="5.66" height="8.5" /></element>
diff --git a/src/mame/layout/mephisto_academy.lay b/src/mame/layout/mephisto_academy.lay
index 4f9ce3a053e..b2486613db6 100644
--- a/src/mame/layout/mephisto_academy.lay
+++ b/src/mame/layout/mephisto_academy.lay
@@ -4,6 +4,25 @@ license:CC0
 -->
 <mamelayout version="2">
 
+<!-- luascript (-plugin layout), for pressing 2 buttons simultaneously -->
+
+	<script><![CDATA[
+		local layout = {}
+		local prev_state = 0
+
+		function layout.frame()
+			local cur_state = machine.ioport.ports[":CLICKABLE"]:read() & 1
+			if cur_state ~= prev_state then
+				machine.ioport.ports[":KEY"]:field(0x40):set_value(cur_state)
+				machine.ioport.ports[":KEY"]:field(0x80):set_value(cur_state)
+			end
+			prev_state = cur_state
+		end
+
+		return layout
+	]]></script>
+
+
 <!-- define elements -->
 
 	<element name="ledo">
@@ -47,6 +66,10 @@ license:CC0
 		</rect>
 	</element>
 
+	<element name="nothing" defstate="0">
+		<rect><color alpha="0" /></rect>
+	</element>
+
 	<element name="background"><rect><color red="0.56" green="0.33" blue="0.12" /></rect></element>
 	<element name="bmask"><rect><color red="0.6" green="0.6" blue="0.6" /></rect></element>
 	<element name="white"><rect><color red="0.84" green="0.75" blue="0.50" /></rect></element>
@@ -455,6 +478,9 @@ license:CC0
 		<element ref="hlbr" inputtag="KEY" inputmask="0x40">      <bounds x="69" y="3.75" width="1.5" height="2.5" /> </element>
 		<element ref="hlbr" inputtag="KEY" inputmask="0x80">      <bounds x="75" y="3.75" width="1.5" height="2.5" /> </element>
 
+		<!-- hidden input below ENT/CL buttons to press both -->
+		<element ref="nothing" inputtag="CLICKABLE" inputmask="0x01"><bounds x="69" y="6.85" width="7.5" height="1.3" /></element>
+
 		<element ref="ledo"><bounds x="31.1" y="0.1" width="1.3" height="1.3" /></element>
 		<element ref="ledo"><bounds x="37.1" y="0.1" width="1.3" height="1.3" /></element>
 		<element ref="ledo"><bounds x="43.1" y="0.1" width="1.3" height="1.3" /></element>
diff --git a/src/mame/layout/mephisto_amsterdam.lay b/src/mame/layout/mephisto_amsterdam.lay
index 61b125e5cfd..ed59f553462 100644
--- a/src/mame/layout/mephisto_amsterdam.lay
+++ b/src/mame/layout/mephisto_amsterdam.lay
@@ -4,6 +4,25 @@ license:CC0
 -->
 <mamelayout version="2">
 
+<!-- luascript (-plugin layout), for pressing 2 buttons simultaneously -->
+
+	<script><![CDATA[
+		local layout = {}
+		local prev_state = 0
+
+		function layout.frame()
+			local cur_state = machine.ioport.ports[":CLICKABLE"]:read() & 1
+			if cur_state ~= prev_state then
+				machine.ioport.ports[":RESET"]:field(0x01):set_value(cur_state)
+				machine.ioport.ports[":RESET"]:field(0x02):set_value(cur_state)
+			end
+			prev_state = cur_state
+		end
+
+		return layout
+	]]></script>
+
+
 <!-- define elements -->
 
 	<element name="led" defstate="0">
@@ -25,6 +44,10 @@ license:CC0
 		</rect>
 	</element>
 
+	<element name="nothing" defstate="0">
+		<rect><color alpha="0" /></rect>
+	</element>
+
 	<element name="text_1"><rect><color red="0.56" green="0.33" blue="0.12" /></rect><text string="1"><color red="0.87" green="0.87" blue="0.84" /></text></element>
 	<element name="text_2"><rect><color red="0.56" green="0.33" blue="0.12" /></rect><text string="2"><color red="0.87" green="0.87" blue="0.84" /></text></element>
 	<element name="text_3"><rect><color red="0.56" green="0.33" blue="0.12" /></rect><text string="3"><color red="0.87" green="0.87" blue="0.84" /></text></element>
@@ -511,8 +534,11 @@ license:CC0
 		<element ref="keys" inputtag="KEY.1" inputmask="0x10"><bounds x="89" y="98" width="4" height="4" /><color alpha="0.25" /></element>
 		<element ref="keys" inputtag="KEY.1" inputmask="0x20"><bounds x="94" y="98" width="4" height="4" /><color alpha="0.25" /></element>
 
+		<element ref="nothing" inputtag="CLICKABLE" inputmask="0x01"><bounds x="69" y="103" width="4" height="4" /></element>
+		<element ref="nothing" inputtag="CLICKABLE" inputmask="0x01"><bounds x="74" y="103" width="4" height="4" /></element>
 		<element ref="keys" inputtag="RESET" inputmask="0x01"><bounds x="69" y="103" width="4" height="4" /><color alpha="0.25" /></element>
 		<element ref="keys" inputtag="RESET" inputmask="0x02"><bounds x="74" y="103" width="4" height="4" /><color alpha="0.25" /></element>
+
 		<element ref="keys" inputtag="KEY.0" inputmask="0x40"><bounds x="79" y="103" width="4" height="4" /><color alpha="0.25" /></element>
 		<element ref="keys" inputtag="KEY.0" inputmask="0x80"><bounds x="84" y="103" width="4" height="4" /><color alpha="0.25" /></element>
 		<element ref="keys" inputtag="KEY.1" inputmask="0x40"><bounds x="89" y="103" width="4" height="4" /><color alpha="0.25" /></element>
diff --git a/src/mame/layout/mephisto_berlin.lay b/src/mame/layout/mephisto_berlin.lay
index 9137db611d3..e23747c37d0 100644
--- a/src/mame/layout/mephisto_berlin.lay
+++ b/src/mame/layout/mephisto_berlin.lay
@@ -4,6 +4,25 @@ license:CC0
 -->
 <mamelayout version="2">
 
+<!-- luascript (-plugin layout), for pressing 2 buttons simultaneously -->
+
+	<script><![CDATA[
+		local layout = {}
+		local prev_state = 0
+
+		function layout.frame()
+			local cur_state = machine.ioport.ports[":CLICKABLE"]:read() & 1
+			if cur_state ~= prev_state then
+				machine.ioport.ports[":KEY"]:field(0x40):set_value(cur_state)
+				machine.ioport.ports[":KEY"]:field(0x80):set_value(cur_state)
+			end
+			prev_state = cur_state
+		end
+
+		return layout
+	]]></script>
+
+
 <!-- define elements -->
 
 	<element name="led" defstate="0">
@@ -25,6 +44,10 @@ license:CC0
 		</rect>
 	</element>
 
+	<element name="nothing" defstate="0">
+		<rect><color alpha="0" /></rect>
+	</element>
+
 	<element name="text_1">       <text string="1">        <color red="0.9" green="0.9" blue="0.9" /></text> </element>
 	<element name="text_2">       <text string="2">        <color red="0.9" green="0.9" blue="0.9" /></text> </element>
 	<element name="text_3">       <text string="3">        <color red="0.9" green="0.9" blue="0.9" /></text> </element>
@@ -368,14 +391,18 @@ license:CC0
 	<group name="panel2">
 		<bounds left="0" right="24" top="11" bottom="24" />
 
-		<element ref="hlb" inputtag="KEY" inputmask="0x04">   <bounds x="0.5"  y="11" width="5" height="1" /> </element>
-		<element ref="hlb" inputtag="KEY" inputmask="0x08">   <bounds x="6.5"  y="11" width="5" height="1" /> </element>
-		<element ref="hlb" inputtag="KEY" inputmask="0x10">   <bounds x="12.5" y="11" width="5" height="1" /> </element>
-		<element ref="hlb" inputtag="KEY" inputmask="0x20">   <bounds x="18.5" y="11" width="5" height="1" /> </element>
-		<element ref="hlb" inputtag="KEY" inputmask="0x40">   <bounds x="0.5"  y="20" width="5" height="1" /> </element>
-		<element ref="hlb" inputtag="KEY" inputmask="0x80">   <bounds x="6.5"  y="20" width="5" height="1" /> </element>
-		<element ref="hlb" inputtag="KEY" inputmask="0x02">   <bounds x="12.5" y="20" width="5" height="1" /> </element>
-		<element ref="hlb" inputtag="KEY" inputmask="0x01">   <bounds x="18.5" y="20" width="5" height="1" /> </element>
+		<element ref="hlb" inputtag="KEY" inputmask="0x04"><bounds x="0.5"  y="11" width="5" height="1" /></element>
+		<element ref="hlb" inputtag="KEY" inputmask="0x08"><bounds x="6.5"  y="11" width="5" height="1" /></element>
+		<element ref="hlb" inputtag="KEY" inputmask="0x10"><bounds x="12.5" y="11" width="5" height="1" /></element>
+		<element ref="hlb" inputtag="KEY" inputmask="0x20"><bounds x="18.5" y="11" width="5" height="1" /></element>
+
+		<element ref="nothing" inputtag="CLICKABLE" inputmask="0x01"><bounds x="0.5" y="20" width="5" height="1" /></element>
+		<element ref="nothing" inputtag="CLICKABLE" inputmask="0x01"><bounds x="6.5" y="20" width="5" height="1" /></element>
+		<element ref="hlb" inputtag="KEY" inputmask="0x40"><bounds x="0.5" y="20" width="5" height="1" /></element>
+		<element ref="hlb" inputtag="KEY" inputmask="0x80"><bounds x="6.5" y="20" width="5" height="1" /></element>
+
+		<element ref="hlb" inputtag="KEY" inputmask="0x02"><bounds x="12.5" y="20" width="5" height="1" /></element>
+		<element ref="hlb" inputtag="KEY" inputmask="0x01"><bounds x="18.5" y="20" width="5" height="1" /></element>
 
 		<element ref="text_up">       <bounds x="0.5"  y="12.5" width="5"  height="1.4" /> </element>
 		<element ref="text_down">     <bounds x="6.5"  y="12.5" width="5"  height="1.4" /> </element>
diff --git a/src/mame/layout/mephisto_bup.lay b/src/mame/layout/mephisto_bup.lay
index 7fb4fb18c74..7e0550a2a1a 100644
--- a/src/mame/layout/mephisto_bup.lay
+++ b/src/mame/layout/mephisto_bup.lay
@@ -4,6 +4,25 @@ license:CC0
 -->
 <mamelayout version="2">
 
+<!-- luascript (-plugin layout), for pressing 2 buttons simultaneously -->
+
+	<script><![CDATA[
+		local layout = {}
+		local prev_state = 0
+
+		function layout.frame()
+			local cur_state = machine.ioport.ports[":CLICKABLE"]:read() & 1
+			if cur_state ~= prev_state then
+				machine.ioport.ports[":RESET"]:field(0x01):set_value(cur_state)
+				machine.ioport.ports[":RESET"]:field(0x02):set_value(cur_state)
+			end
+			prev_state = cur_state
+		end
+
+		return layout
+	]]></script>
+
+
 <!-- define elements -->
 
 	<element name="led" defstate="0">
@@ -25,6 +44,10 @@ license:CC0
 		</rect>
 	</element>
 
+	<element name="nothing" defstate="0">
+		<rect><color alpha="0" /></rect>
+	</element>
+
 	<element name="text_1"><rect><color red="0.56" green="0.33" blue="0.12" /></rect><text string="1"><color red="0.87" green="0.87" blue="0.84" /></text></element>
 	<element name="text_2"><rect><color red="0.56" green="0.33" blue="0.12" /></rect><text string="2"><color red="0.87" green="0.87" blue="0.84" /></text></element>
 	<element name="text_3"><rect><color red="0.56" green="0.33" blue="0.12" /></rect><text string="3"><color red="0.87" green="0.87" blue="0.84" /></text></element>
@@ -525,8 +548,11 @@ license:CC0
 		<element ref="keys" inputtag="KEY.1" inputmask="0x01"><bounds x="89" y="98" width="4" height="4" /><color alpha="0.25" /></element>
 		<element ref="keys" inputtag="KEY.1" inputmask="0x02"><bounds x="94" y="98" width="4" height="4" /><color alpha="0.25" /></element>
 
+		<element ref="nothing" inputtag="CLICKABLE" inputmask="0x01"><bounds x="69" y="103" width="4" height="4" /></element>
+		<element ref="nothing" inputtag="CLICKABLE" inputmask="0x01"><bounds x="74" y="103" width="4" height="4" /></element>
 		<element ref="keys" inputtag="RESET" inputmask="0x01"><bounds x="69" y="103" width="4" height="4" /><color alpha="0.25" /></element>
 		<element ref="keys" inputtag="RESET" inputmask="0x02"><bounds x="74" y="103" width="4" height="4" /><color alpha="0.25" /></element>
+
 		<element ref="keys" inputtag="KEY.1" inputmask="0x04"><bounds x="79" y="103" width="4" height="4" /><color alpha="0.25" /></element>
 		<element ref="keys" inputtag="KEY.1" inputmask="0x10"><bounds x="84" y="103" width="4" height="4" /><color alpha="0.25" /></element>
 		<element ref="keys" inputtag="KEY.0" inputmask="0x80"><bounds x="89" y="103" width="4" height="4" /><color alpha="0.25" /></element>
diff --git a/src/mame/layout/mephisto_milano.lay b/src/mame/layout/mephisto_milano.lay
index 696889dc5f2..9055933f66d 100644
--- a/src/mame/layout/mephisto_milano.lay
+++ b/src/mame/layout/mephisto_milano.lay
@@ -3,6 +3,26 @@
 license:CC0
 -->
 <mamelayout version="2">
+
+<!-- luascript (-plugin layout), for pressing 2 buttons simultaneously -->
+
+	<script><![CDATA[
+		local layout = {}
+		local prev_state = 0
+
+		function layout.frame()
+			local cur_state = machine.ioport.ports[":CLICKABLE"]:read() & 1
+			if cur_state ~= prev_state then
+				machine.ioport.ports[":KEY"]:field(0x40):set_value(cur_state)
+				machine.ioport.ports[":KEY"]:field(0x80):set_value(cur_state)
+			end
+			prev_state = cur_state
+		end
+
+		return layout
+	]]></script>
+
+
 <!-- define elements -->
 
 	<element name="white"><rect><color red="1" green="1" blue="1" /></rect></element>
@@ -36,6 +56,10 @@ license:CC0
 		</rect>
 	</element>
 
+	<element name="nothing" defstate="0">
+		<rect><color alpha="0" /></rect>
+	</element>
+
 	<element name="text_1">        <text string="1">        <color red="1" green="1" blue="1" /></text> </element>
 	<element name="text_2">        <text string="2">        <color red="1" green="1" blue="1" /></text> </element>
 	<element name="text_3">        <text string="3">        <color red="1" green="1" blue="1" /></text> </element>
@@ -378,6 +402,9 @@ license:CC0
 		<element ref="hlb" inputtag="KEY" inputmask="0x40">   <bounds x="12.5" y="20" width="5" height="1" /> </element>
 		<element ref="hlb" inputtag="KEY" inputmask="0x80">   <bounds x="18.5" y="20" width="5" height="1" /> </element>
 
+		<!-- hidden input below ENTER/CLEAR buttons to press both -->
+		<element ref="nothing" inputtag="CLICKABLE" inputmask="0x01"><bounds x="14.7" y="21.65" width="6.6" height="1.2" /></element>
+
 		<element ref="text_training"> <bounds x="0"  y="9"  width="6" height="1.4" /> </element>
 		<element ref="text_info">     <bounds x="6"  y="9"  width="6" height="1.4" /> </element>
 		<element ref="text_memory">   <bounds x="12" y="9"  width="6" height="1.4" /> </element>
diff --git a/src/mame/layout/mephisto_mm2.lay b/src/mame/layout/mephisto_mm2.lay
index 72e27340105..2793b243eed 100644
--- a/src/mame/layout/mephisto_mm2.lay
+++ b/src/mame/layout/mephisto_mm2.lay
@@ -4,6 +4,25 @@ license:CC0
 -->
 <mamelayout version="2">
 
+<!-- luascript (-plugin layout), for pressing 2 buttons simultaneously -->
+
+	<script><![CDATA[
+		local layout = {}
+		local prev_state = 0
+
+		function layout.frame()
+			local cur_state = machine.ioport.ports[":CLICKABLE"]:read() & 1
+			if cur_state ~= prev_state then
+				machine.ioport.ports[":RESET"]:field(0x01):set_value(cur_state)
+				machine.ioport.ports[":RESET"]:field(0x02):set_value(cur_state)
+			end
+			prev_state = cur_state
+		end
+
+		return layout
+	]]></script>
+
+
 <!-- define elements -->
 
 	<element name="led" defstate="0">
@@ -25,6 +44,10 @@ license:CC0
 		</rect>
 	</element>
 
+	<element name="nothing" defstate="0">
+		<rect><color alpha="0" /></rect>
+	</element>
+
 	<element name="text_1"><rect><color red="0.56" green="0.33" blue="0.12" /></rect><text string="1"><color red="0.87" green="0.87" blue="0.84" /></text></element>
 	<element name="text_2"><rect><color red="0.56" green="0.33" blue="0.12" /></rect><text string="2"><color red="0.87" green="0.87" blue="0.84" /></text></element>
 	<element name="text_3"><rect><color red="0.56" green="0.33" blue="0.12" /></rect><text string="3"><color red="0.87" green="0.87" blue="0.84" /></text></element>
@@ -534,8 +557,11 @@ license:CC0
 		<element ref="keys" inputtag="KEY.1" inputmask="0x01"><bounds x="89" y="98" width="4" height="4" /><color alpha="0.25" /></element>
 		<element ref="keys" inputtag="KEY.1" inputmask="0x02"><bounds x="94" y="98" width="4" height="4" /><color alpha="0.25" /></element>
 
+		<element ref="nothing" inputtag="CLICKABLE" inputmask="0x01"><bounds x="69" y="103" width="4" height="4" /></element>
+		<element ref="nothing" inputtag="CLICKABLE" inputmask="0x01"><bounds x="74" y="103" width="4" height="4" /></element>
 		<element ref="keys" inputtag="RESET" inputmask="0x01"><bounds x="69" y="103" width="4" height="4" /><color alpha="0.25" /></element>
 		<element ref="keys" inputtag="RESET" inputmask="0x02"><bounds x="74" y="103" width="4" height="4" /><color alpha="0.25" /></element>
+
 		<element ref="keys" inputtag="KEY.1" inputmask="0x04"><bounds x="79" y="103" width="4" height="4" /><color alpha="0.25" /></element>
 		<element ref="keys" inputtag="KEY.1" inputmask="0x10"><bounds x="84" y="103" width="4" height="4" /><color alpha="0.25" /></element>
 		<element ref="keys" inputtag="KEY.0" inputmask="0x80"><bounds x="89" y="103" width="4" height="4" /><color alpha="0.25" /></element>
diff --git a/src/mame/layout/mephisto_mm5.lay b/src/mame/layout/mephisto_mm5.lay
index 36d76cdc905..727b0dfd6b8 100644
--- a/src/mame/layout/mephisto_mm5.lay
+++ b/src/mame/layout/mephisto_mm5.lay
@@ -6,6 +6,25 @@ license:CC0
 
 <!-- same as MM II, but clock symbol changed to INFO -->
 
+<!-- luascript (-plugin layout), for pressing 2 buttons simultaneously -->
+
+	<script><![CDATA[
+		local layout = {}
+		local prev_state = 0
+
+		function layout.frame()
+			local cur_state = machine.ioport.ports[":CLICKABLE"]:read() & 1
+			if cur_state ~= prev_state then
+				machine.ioport.ports[":RESET"]:field(0x01):set_value(cur_state)
+				machine.ioport.ports[":RESET"]:field(0x02):set_value(cur_state)
+			end
+			prev_state = cur_state
+		end
+
+		return layout
+	]]></script>
+
+
 <!-- define elements -->
 
 	<element name="led" defstate="0">
@@ -27,6 +46,10 @@ license:CC0
 		</rect>
 	</element>
 
+	<element name="nothing" defstate="0">
+		<rect><color alpha="0" /></rect>
+	</element>
+
 	<element name="text_1"><rect><color red="0.56" green="0.33" blue="0.12" /></rect><text string="1"><color red="0.87" green="0.87" blue="0.84" /></text></element>
 	<element name="text_2"><rect><color red="0.56" green="0.33" blue="0.12" /></rect><text string="2"><color red="0.87" green="0.87" blue="0.84" /></text></element>
 	<element name="text_3"><rect><color red="0.56" green="0.33" blue="0.12" /></rect><text string="3"><color red="0.87" green="0.87" blue="0.84" /></text></element>
@@ -530,8 +553,11 @@ license:CC0
 		<element ref="keys" inputtag="KEY.1" inputmask="0x01"><bounds x="89" y="98" width="4" height="4" /><color alpha="0.25" /></element>
 		<element ref="keys" inputtag="KEY.1" inputmask="0x02"><bounds x="94" y="98" width="4" height="4" /><color alpha="0.25" /></element>
 
+		<element ref="nothing" inputtag="CLICKABLE" inputmask="0x01"><bounds x="69" y="103" width="4" height="4" /></element>
+		<element ref="nothing" inputtag="CLICKABLE" inputmask="0x01"><bounds x="74" y="103" width="4" height="4" /></element>
 		<element ref="keys" inputtag="RESET" inputmask="0x01"><bounds x="69" y="103" width="4" height="4" /><color alpha="0.25" /></element>
 		<element ref="keys" inputtag="RESET" inputmask="0x02"><bounds x="74" y="103" width="4" height="4" /><color alpha="0.25" /></element>
+
 		<element ref="keys" inputtag="KEY.1" inputmask="0x04"><bounds x="79" y="103" width="4" height="4" /><color alpha="0.25" /></element>
 		<element ref="keys" inputtag="KEY.1" inputmask="0x10"><bounds x="84" y="103" width="4" height="4" /><color alpha="0.25" /></element>
 		<element ref="keys" inputtag="KEY.0" inputmask="0x80"><bounds x="89" y="103" width="4" height="4" /><color alpha="0.25" /></element>
diff --git a/src/mame/layout/mephisto_modena.lay b/src/mame/layout/mephisto_modena.lay
index 65332c989f3..6ea04c620f3 100644
--- a/src/mame/layout/mephisto_modena.lay
+++ b/src/mame/layout/mephisto_modena.lay
@@ -4,6 +4,25 @@ license:CC0
 -->
 <mamelayout version="2">
 
+<!-- luascript (-plugin layout), for pressing 2 buttons simultaneously -->
+
+	<script><![CDATA[
+		local layout = {}
+		local prev_state = 0
+
+		function layout.frame()
+			local cur_state = machine.ioport.ports[":CLICKABLE"]:read() & 1
+			if cur_state ~= prev_state then
+				machine.ioport.ports[":KEY"]:field(0x40):set_value(cur_state)
+				machine.ioport.ports[":KEY"]:field(0x80):set_value(cur_state)
+			end
+			prev_state = cur_state
+		end
+
+		return layout
+	]]></script>
+
+
 <!-- define elements -->
 
 	<element name="white"><rect><color red="1" green="1" blue="1" /></rect></element>
@@ -36,6 +55,10 @@ license:CC0
 		</rect>
 	</element>
 
+	<element name="nothing" defstate="0">
+		<rect><color alpha="0" /></rect>
+	</element>
+
 	<element name="text_1">        <text string="1">        <color red="1" green="1" blue="1" /></text> </element>
 	<element name="text_2">        <text string="2">        <color red="1" green="1" blue="1" /></text> </element>
 	<element name="text_3">        <text string="3">        <color red="1" green="1" blue="1" /></text> </element>
@@ -405,6 +428,9 @@ license:CC0
 		<element ref="hlb" inputtag="KEY" inputmask="0x40">   <bounds x="12.5" y="20" width="5" height="1" /> </element>
 		<element ref="hlb" inputtag="KEY" inputmask="0x80">   <bounds x="18.5" y="20" width="5" height="1" /> </element>
 
+		<!-- hidden input below ENTER/CLEAR buttons to press both -->
+		<element ref="nothing" inputtag="CLICKABLE" inputmask="0x01"><bounds x="14.7" y="21.65" width="6.6" height="1.2" /></element>
+
 		<element ref="text_book">     <bounds x="0"  y="9"  width="6" height="1.4" /> </element>
 		<element ref="text_info">     <bounds x="6"  y="9"  width="6" height="1.4" /> </element>
 		<element ref="text_memory">   <bounds x="12" y="9"  width="6" height="1.4" /> </element>
diff --git a/src/mame/layout/mephisto_mondial68k.lay b/src/mame/layout/mephisto_mondial68k.lay
index efbe41c5e52..d9629629546 100644
--- a/src/mame/layout/mephisto_mondial68k.lay
+++ b/src/mame/layout/mephisto_mondial68k.lay
@@ -4,6 +4,25 @@ license:CC0
 -->
 <mamelayout version="2">
 
+<!-- luascript (-plugin layout), for pressing 2 buttons simultaneously -->
+
+	<script><![CDATA[
+		local layout = {}
+		local prev_state = 0
+
+		function layout.frame()
+			local cur_state = machine.ioport.ports[":CLICKABLE"]:read() & 1
+			if cur_state ~= prev_state then
+				machine.ioport.ports[":IN.2"]:field(0x08):set_value(cur_state)
+				machine.ioport.ports[":IN.3"]:field(0x08):set_value(cur_state)
+			end
+			prev_state = cur_state
+		end
+
+		return layout
+	]]></script>
+
+
 <!-- define elements -->
 
 	<element name="digit" defstate="0">
@@ -19,14 +38,13 @@ license:CC0
 		</rect>
 	</element>
 	<element name="hlb" defstate="0">
-		<text string=" ">
-			<bounds x="0.0" y="0.0" width="1.0" height="1.0" />
-			<color red="0.0" green="0.0" blue="0.0" />
-		</text>
-		<disk state="1">
-			<bounds x="0.0" y="0.0" width="1.0" height="1.0" />
+		<rect state="1">
 			<color red="1.0" green="1.0" blue="1.0" />
-		</disk>
+		</rect>
+	</element>
+
+	<element name="nothing" defstate="0">
+		<rect><color alpha="0" /></rect>
 	</element>
 
 	<element name="led7seg_background"><rect><color red="0.54" green="0.57" blue="0.58" />      </rect></element>
@@ -425,6 +443,9 @@ license:CC0
 		<element ref="hlb" inputtag="IN.1" inputmask="0x08">     <bounds x="55.5" y="6.5" width="6" height="4" />        <color alpha="0.3"/></element>
 		<element ref="hlb" inputtag="IN.2" inputmask="0x08">     <bounds x="64"   y="6.5" width="6" height="4" />        <color alpha="0.3"/></element>
 		<element ref="hlb" inputtag="IN.3" inputmask="0x08">     <bounds x="72.5" y="6.5" width="6" height="4" />        <color alpha="0.3"/></element>
+
+		<!-- hidden input between CL/ENT buttons to press both -->
+		<element ref="nothing" inputtag="CLICKABLE" inputmask="0x01"><bounds x="70" y="6.5" width="2.5" height="4" /></element>
 	</group>
 
 
diff --git a/src/mame/layout/mephisto_polgar.lay b/src/mame/layout/mephisto_polgar.lay
index 8ebe14d667d..6d63a513ebd 100644
--- a/src/mame/layout/mephisto_polgar.lay
+++ b/src/mame/layout/mephisto_polgar.lay
@@ -2,10 +2,28 @@
 <!--
 license:CC0
 -->
+<mamelayout version="2">
 
 <!-- mephisto_polgar.lay and mephisto_risc.lay are identical -->
 
-<mamelayout version="2">
+<!-- luascript (-plugin layout), for pressing 2 buttons simultaneously -->
+
+	<script><![CDATA[
+		local layout = {}
+		local prev_state = 0
+
+		function layout.frame()
+			local cur_state = machine.ioport.ports[":CLICKABLE"]:read() & 1
+			if cur_state ~= prev_state then
+				machine.ioport.ports[":KEY"]:field(0x40):set_value(cur_state)
+				machine.ioport.ports[":KEY"]:field(0x80):set_value(cur_state)
+			end
+			prev_state = cur_state
+		end
+
+		return layout
+	]]></script>
+
 
 <!-- define elements -->
 
@@ -28,6 +46,10 @@ license:CC0
 		</rect>
 	</element>
 
+	<element name="nothing" defstate="0">
+		<rect><color alpha="0" /></rect>
+	</element>
+
 	<element name="text_1"> <rect><color red="0.56" green="0.33" blue="0.12" /></rect>    <text string="1"><color red="0.87" green="0.87" blue="0.84" /></text> </element>
 	<element name="text_2"> <rect><color red="0.56" green="0.33" blue="0.12" /></rect>    <text string="2"><color red="0.87" green="0.87" blue="0.84" /></text> </element>
 	<element name="text_3"> <rect><color red="0.56" green="0.33" blue="0.12" /></rect>    <text string="3"><color red="0.87" green="0.87" blue="0.84" /></text> </element>
@@ -420,6 +442,9 @@ license:CC0
 		<element ref="hlb" inputtag="KEY" inputmask="0x20">       <bounds x="54.5" y="3" width="3.5" height="2.5" />  </element>
 		<element ref="hlb" inputtag="KEY" inputmask="0x40">       <bounds x="49.5" y="10" width="3.5" height="2.5" />  </element>
 		<element ref="hlb" inputtag="KEY" inputmask="0x80">       <bounds x="54.5" y="10" width="3.5" height="2.5" />  </element>
+
+		<!-- hidden input above ENT/CL buttons to press both -->
+		<element ref="nothing" inputtag="CLICKABLE" inputmask="0x01"><bounds x="52.2" y="8.0" width="3.1" height="1.1" /></element>
 	</group>
 
 
diff --git a/src/mame/layout/mephisto_risc.lay b/src/mame/layout/mephisto_risc.lay
index 8ebe14d667d..6d63a513ebd 100644
--- a/src/mame/layout/mephisto_risc.lay
+++ b/src/mame/layout/mephisto_risc.lay
@@ -2,10 +2,28 @@
 <!--
 license:CC0
 -->
+<mamelayout version="2">
 
 <!-- mephisto_polgar.lay and mephisto_risc.lay are identical -->
 
-<mamelayout version="2">
+<!-- luascript (-plugin layout), for pressing 2 buttons simultaneously -->
+
+	<script><![CDATA[
+		local layout = {}
+		local prev_state = 0
+
+		function layout.frame()
+			local cur_state = machine.ioport.ports[":CLICKABLE"]:read() & 1
+			if cur_state ~= prev_state then
+				machine.ioport.ports[":KEY"]:field(0x40):set_value(cur_state)
+				machine.ioport.ports[":KEY"]:field(0x80):set_value(cur_state)
+			end
+			prev_state = cur_state
+		end
+
+		return layout
+	]]></script>
+
 
 <!-- define elements -->
 
@@ -28,6 +46,10 @@ license:CC0
 		</rect>
 	</element>
 
+	<element name="nothing" defstate="0">
+		<rect><color alpha="0" /></rect>
+	</element>
+
 	<element name="text_1"> <rect><color red="0.56" green="0.33" blue="0.12" /></rect>    <text string="1"><color red="0.87" green="0.87" blue="0.84" /></text> </element>
 	<element name="text_2"> <rect><color red="0.56" green="0.33" blue="0.12" /></rect>    <text string="2"><color red="0.87" green="0.87" blue="0.84" /></text> </element>
 	<element name="text_3"> <rect><color red="0.56" green="0.33" blue="0.12" /></rect>    <text string="3"><color red="0.87" green="0.87" blue="0.84" /></text> </element>
@@ -420,6 +442,9 @@ license:CC0
 		<element ref="hlb" inputtag="KEY" inputmask="0x20">       <bounds x="54.5" y="3" width="3.5" height="2.5" />  </element>
 		<element ref="hlb" inputtag="KEY" inputmask="0x40">       <bounds x="49.5" y="10" width="3.5" height="2.5" />  </element>
 		<element ref="hlb" inputtag="KEY" inputmask="0x80">       <bounds x="54.5" y="10" width="3.5" height="2.5" />  </element>
+
+		<!-- hidden input above ENT/CL buttons to press both -->
+		<element ref="nothing" inputtag="CLICKABLE" inputmask="0x01"><bounds x="52.2" y="8.0" width="3.1" height="1.1" /></element>
 	</group>
 
 
diff --git a/src/mame/layout/mephisto_smondial.lay b/src/mame/layout/mephisto_smondial.lay
index f785d718033..72cfa6d66d3 100644
--- a/src/mame/layout/mephisto_smondial.lay
+++ b/src/mame/layout/mephisto_smondial.lay
@@ -31,14 +31,9 @@ license:CC0
 		</rect>
 	</element>
 	<element name="hlb" defstate="0">
-		<text string=" ">
-			<bounds x="0.0" y="0.0" width="1.0" height="1.0" />
-			<color red="0.0" green="0.0" blue="0.0" />
-		</text>
-		<disk state="1">
-			<bounds x="0.0" y="0.0" width="1.0" height="1.0" />
+		<rect state="1">
 			<color red="1.0" green="1.0" blue="1.0" />
-		</disk>
+		</rect>
 	</element>
 
 	<element name="led7seg_background"><rect><color red="0.54" green="0.57" blue="0.58" />      </rect></element>
diff --git a/src/mame/layout/mephisto_smondial2.lay b/src/mame/layout/mephisto_smondial2.lay
index f5238e33e7b..56ca03c6164 100644
--- a/src/mame/layout/mephisto_smondial2.lay
+++ b/src/mame/layout/mephisto_smondial2.lay
@@ -31,14 +31,9 @@ license:CC0
 		</rect>
 	</element>
 	<element name="hlb" defstate="0">
-		<text string=" ">
-			<bounds x="0.0" y="0.0" width="1.0" height="1.0" />
-			<color red="0.0" green="0.0" blue="0.0" />
-		</text>
-		<disk state="1">
-			<bounds x="0.0" y="0.0" width="1.0" height="1.0" />
+		<rect state="1">
 			<color red="1.0" green="1.0" blue="1.0" />
-		</disk>
+		</rect>
 	</element>
 
 	<element name="led7seg_background"><rect><color red="0.54" green="0.57" blue="0.58" />      </rect></element>