Input: split the V key -- look-behind stays, view toggle moves to F1

'V' was double-bound: the authentic look-behind (held) AND the cockpit/chase
view toggle (edge), so a single press flipped the camera while also looking
behind. Move the view toggle to F1 (unused); V is now look-behind only.

The view toggle is a desktop-only convenience (no RIO equivalent) so it stays
on `focused`, always live -- including under PadRIO. Look-behind keeps the
BT_DEVKEYS `gfocus` gate (a RIO device's binding owns it when engaged).

Dist README/environ.ini corrected to match reality: under L4CONTROLS=PAD the
default keyboard driving is the NumPad (WASD are MFD-bank buttons in the default
bindings.txt), the controller left stick drives, F1/backtick/V-hold are the
always-live desktop keys, and BT_DEVKEYS=1 re-enables the built-in quick keys.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

game/reconstructed/mech4.cpp

@@ -2684,17 +2684,22 @@ void
 					const int xNow = gfocus && (pAsync('X') & dn) ? 1 : 0;
 					if (xNow && !sPrevX) gBTDrive.allStop = 1;	// edge -> one all-stop
 					sPrevX = xNow;
-					// V: toggle the view between the authentic COCKPIT eyepoint
-					// (the pod's only view) and the external chase camera.
-					static int sPrevV = 0, sViewInside = 0;
-					const int vNow = focused && (pAsync('V') & dn) ? 1 : 0;
-					if (vNow && !sPrevV)
+					// F1: toggle the view between the authentic COCKPIT eyepoint
+					// (the pod's only view) and the external chase camera.  Moved
+					// off 'V' -- which is the authentic look-behind (held) above --
+					// so the two no longer collide (pressing V used to also flip
+					// the camera).  Desktop-only convenience with no RIO equivalent:
+					// stays on `focused` (not the BT_DEVKEYS `gfocus` gate), always
+					// live even under PadRIO.
+					static int sPrevViewKey = 0, sViewInside = 0;
+					const int viewKeyNow = focused && (pAsync(0x70 /*VK_F1*/) & dn) ? 1 : 0;
+					if (viewKeyNow && !sPrevViewKey)
 					{
 						sViewInside = !sViewInside;
 						extern void BTSetViewInside(int inside);
 						BTSetViewInside(sViewInside);
 					}
-					sPrevV = vNow;
+					sPrevViewKey = viewKeyNow;
 
 					// RETICLE = SCREEN CENTER (task #58 correction, supersedes the
 					// task #39 "body-mounted view" model): the CAMERA yaws with

pack-dist.ps1

@@ -132,6 +132,12 @@ BT412STEAM=1
 
 # ---- Optional --------------------------------------------------------------
 
+# The engine also has built-in WASD / 1-4 / M / etc. quick keys that OVERLAP the
+# bindings.txt layout, so under L4CONTROLS=PAD they stand down automatically (the
+# pad + keyboard bindings own the controls). Set to 1 to force them on ALONGSIDE
+# the bindings (hybrid keyboard-drive); 0 to force off. Unset = auto.
+#BT_DEVKEYS=1
+
 # Mission-length override, integer seconds (short test missions). The menu's
 # LENGTH choice sets this; uncomment to force it.
 #BT_MISSION_SECONDS=120
@@ -179,12 +185,22 @@ green MFD surfaces with the pod's RIO button banks (click them with the mouse;
 they light as the game commands their lamps). At the chosen length the mission
 stops and a MISSION COMPLETE scoreboard shows, then it returns to the menu.
 
-Controls (XInput controller and/or keyboard) - rebindable in bindings.txt:
-  Left stick / WASD          drive (throttle holds; A/D steer)
-  X                          all stop
-  Space / A                  fire
+Controls -- under L4CONTROLS=PAD (the shipped default) input comes from the
+XInput controller + keyboard through bindings.txt; edit that file to rebind.
+  Controller left stick      drive (throttle holds position; steer)
+  Controller triggers        pedals;  A / bumpers / face buttons = fire + hat
+  Keyboard (default profile) NumPad 8/2/4/6 = stick, 7/9 = pedals, 0 or Space =
+                             fire, Shift/Ctrl = throttle up/down; the number and
+                             letter rows are the MFD bank buttons and the F-keys
+                             the Secondary columns (full layout in bindings.txt)
   mouse                      click the on-screen cockpit buttons
-  (see bindings.txt for the full default layout)
+Always-live desktop keys (not rebindable):
+  F1                         toggle cockpit / external chase camera
+  `  (backtick)              hide / show the secondary displays (MFDs + radar)
+  V  (hold)                  look behind (rear view; rear-mounted weapons fire)
+(The engine's built-in WASD / 1-4 quick keys overlap the bindings, so they
+stand down under PAD -- set BT412 env BT_DEVKEYS=1 in environ.ini to force
+them on alongside.)
 
 
 MULTIPLAYER - please read