diff --git a/engine/MUNGA_L4/L4PADRIO.cpp b/engine/MUNGA_L4/L4PADRIO.cpp
index 699e673..42ec24c 100644
--- a/engine/MUNGA_L4/L4PADRIO.cpp
+++ b/engine/MUNGA_L4/L4PADRIO.cpp
@@ -352,6 +352,42 @@ void
 void
 	PadRIO::Poll()
 {
+	//
+	// BT_BTNTEST="addr,pressPoll,releasePoll" (dev): scripted screen-button
+	// press through the REAL click seam (EmitButton -> RIO queue -> manager
+	// drain -> buttonGroup mapping) -- verifies the cockpit-click chain
+	// headlessly.  Example: BT_BTNTEST=8,600,1200 holds button 0x8 (an MFD1
+	// PROGRAM element) from poll 600 to poll 1200.
+	//
+	{
+		static int s_btnAddr = -2, s_btnOn = 0, s_btnOff = 0, s_poll = 0, s_state = 0;
+		if (s_btnAddr == -2)
+		{
+			s_btnAddr = -1;
+			const char *e = getenv("BT_BTNTEST");
+			if (e != NULL)
+				sscanf(e, "%i,%i,%i", &s_btnAddr, &s_btnOn, &s_btnOff);
+		}
+		if (s_btnAddr >= 0)
+		{
+			++s_poll;
+			if (s_state == 0 && s_poll >= s_btnOn)
+			{
+				s_state = 1;
+				EmitButton(s_btnAddr, 1);
+				DEBUG_STREAM << "[btntest] PRESS 0x" << std::hex << s_btnAddr
+					<< std::dec << " at poll " << s_poll << "\n" << std::flush;
+			}
+			else if (s_state == 1 && s_poll >= s_btnOff)
+			{
+				s_state = 2;
+				EmitButton(s_btnAddr, 0);
+				DEBUG_STREAM << "[btntest] RELEASE 0x" << std::hex << s_btnAddr
+					<< std::dec << " at poll " << s_poll << "\n" << std::flush;
+			}
+		}
+	}
+
 	unsigned long now = timeGetTime();
 	float dt = (lastPollMilliseconds == 0)
 		? 0.0f
diff --git a/game/reconstructed/mechweap.cpp b/game/reconstructed/mechweap.cpp
index 828de2f..9db8505 100644
--- a/game/reconstructed/mechweap.cpp
+++ b/game/reconstructed/mechweap.cpp
@@ -218,6 +218,13 @@ void
 			ConfigureMappablesMessageID,				// 9
 			0);											// active_message_id (direct bind)
 	}
+	// [cfgmap] diagnostic (BT_FIRE_LOG): the session bracket + resulting mode.
+	if (getenv("BT_FIRE_LOG"))
+		DEBUG_STREAM << "[cfgmap] " << ((value < 1) ? "EXIT" : "ENTER")
+			<< " session on " << GetName() << " (elem 0x" << std::hex << element
+			<< ") mode now=0x"
+			<< (unsigned)application->GetModeManager()->GetModeMask()
+			<< std::dec << std::endl;
 }
 
 //
@@ -242,6 +249,10 @@ void
 			mapper->AddOrErase(							// vtbl+0x44 (direct overload)
 				(unsigned int)message->dataContents,	// RAW 1-based
 				(ControlsButton *)&fireImpulse);
+			if (getenv("BT_FIRE_LOG"))
+				DEBUG_STREAM << "[cfgmap] ChooseButton toggle btn 0x" << std::hex
+					<< (message->dataContents - 1) << std::dec
+					<< " on " << GetName() << std::endl;
 		}
 	}
 }
diff --git a/players/play_solo.bat b/players/play_solo.bat
index be03893..a9fd790 100644
--- a/players/play_solo.bat
+++ b/players/play_solo.bat
@@ -2,13 +2,27 @@
 rem BT411 -- single-player practice (no network, no operator).
 rem Edit the -egg below for other maps (ARENA2/DBASE/FOGDAY/...).
 cd /d %~dp0
-if not exist "build\Release\btl4.exe" goto badpath
+rem Prefer the GLASS build when present (dev checkout): it carries PadRIO, the
+rem click-to-button seam that makes the cockpit surround's MFD red buttons,
+rem radar rails and joystick buttons mouse-clickable (trigger config needs
+rem this).  The pod build renders the same cockpit but its clicks are a no-op
+rem (PadRIO is not compiled there); player zips ship only build\.
+set GAME=build\Release\btl4.exe
+if exist "build-glass\Release\btl4.exe" (
+  set GAME=build-glass\Release\btl4.exe
+  rem The GLASS platform profile is what creates PadRIO (L4CONTROLS=PAD):
+  rem without it the boot falls to the DEV profile (KEYBOARD only) and every
+  rem cockpit click is silently discarded -- trigger config dead, keymap on
+  rem the btinput/CONTROLS.MAP engine instead of PadRIO/bindings.txt.
+  set BT_PLATFORM=glass
+)
+if not exist "%GAME%" goto badpath
 if not exist "content\OPERATOR.EGG" goto badpath
 set BT_START_INSIDE=1
 set BT_DEV_GAUGES=1
 set BT_LOG=join.log
 cd content
-..\build\Release\btl4.exe -egg ARENA1.EGG
+..\%GAME% -egg ARENA1.EGG
 echo.
 echo The game has exited.  If it closed unexpectedly,
 echo send the operator content\join.log.