diff --git a/docs/HANDOFF.md b/docs/HANDOFF.md
index 73ffce48..9b78b5d2 100644
--- a/docs/HANDOFF.md
+++ b/docs/HANDOFF.md
@@ -311,6 +311,27 @@ behavior exactly.
   idle machine the user drove Silo live past ~1800 frames, VI pacemaker
   healthy, no stall. See `docs/M-25-QOL-REVIEW.md`.
 
+## Done this session (M-26) — port-layer QoL batch (A/B/C/E)
+
+Low-risk QoL, `port/` only, zero `src/` change. All defaults reproduce
+prior behaviour. Full review: **`docs/M-26-QOL-REVIEW.md`**.
+
+- **A — save-on-exit + `[Window]` persistence.** `atexit(portAtExit)` in
+  `main.c` (`videoSaveWindowState()` + `configSave()`), fires on every
+  clean quit (`exit(0)` in `videoPumpEvents`); `abort()` paths skip it.
+  New `[Window]` ini section (`Width/Height/X/Y/Maximized`, sentinels =
+  old behaviour) in `video.c`; `Video.Fullscreen` now round-trips.
+- **B — `level_sweep.sh` STALLED verdict.** Frames rendered then froze
+  with the process still alive → `STALLED (froze at N/M frames)` instead
+  of a bogus PASS (the Silo case). Retried once like NO-FRAMES.
+- **C — raw mouse input.** `Input.MouseRawInput=1` (default 0) sets the
+  SDL relative-scale / warp hints off in `inputInit` — no OS pointer accel.
+- **E — `--help` / `--version`** in `main.c` before `crashInit()`: build
+  id, usage, the 21-level `-level_XX` table.
+- **Verified:** build green (`ntsc-final`); `-level_09` + `-level_20`
+  boot crash-free 6/6 GE_PCDUMP frames (unregressed); `ge007.ini` gains a
+  populated `[Window]` block on exit.
+
 ## Next task (M-24 — Opus 5)
 
 **Scope call (user, M-23):** D139 (stage unload) + D140 (pause menu / watch)
diff --git a/docs/M-26-QOL-REVIEW.md b/docs/M-26-QOL-REVIEW.md
new file mode 100644
index 00000000..fcb0e03b
--- /dev/null
+++ b/docs/M-26-QOL-REVIEW.md
@@ -0,0 +1,56 @@
+# M-26 QoL review — save-on-exit, window persistence, raw mouse, --help, STALLED verdict
+
+Port-layer only. Zero `src/` / game-logic change. Every default reproduces
+prior behaviour exactly (all new knobs default-off / default-current).
+
+## A — `atexit()` save-on-exit + `[Window]` persistence
+
+- `port/src/main.c`: `atexit(portAtExit)` registered right after
+  `configLoad()`. `portAtExit` = `videoSaveWindowState()` then
+  `configSave()`. The `exit(0)` in `videoPumpEvents` (SDL_QUIT / ESC /
+  window-close) is reachable, so the handler fires on every clean quit.
+  Crash / `sysFatalError` paths call `abort()` → handler does **not** run
+  (intended — don't persist a broken state).
+- `port/src/video.c`: new `[Window]` config section — `Width`, `Height`,
+  `X`, `Y`, `Maximized`. Sentinels reproduce the old hardcoded behaviour:
+  `Width/Height = 0` → native (640×480 / 640×400), `X/Y = -1` → SDL
+  centres the window. `videoInit` uses them for the `GfxWindowInitSettings`.
+- `videoSaveWindowState()` reads `wmAPI->get_fullscreen_state` /
+  `get_maximized_state` / `get_dimensions` (all already in the SDL2 wapi
+  backend) and writes geometry back into the cfg vars. A maximized or
+  fullscreen window keeps its last *restored* size/pos on disk and only
+  updates the flag. `Video.Fullscreen` now round-trips too.
+- **Verified:** `-level_09` / `-level_20` boot crash-free (6/6 GE_PCDUMP
+  frames each, unregressed); `ge007.ini` gains a populated `[Window]`
+  block on exit; relaunch reads it back with no unknown-key warnings.
+
+## B — `level_sweep.sh` STALLED verdict
+
+Pure shell (not built). A level that renders a few frames then freezes
+while the process stays alive (the Silo `-level_20` fly-down case,
+D117/D134 machine-load sensitivity) previously reported **PASS** because
+`last=$(ls ppm/*.ppm | tail -1)` was non-empty. Now the watchdog records
+`stalled=1` when the frame count is frozen for `STALL_SECS`, and `alive=1`
+if the process was still running when the watchdog gave up →
+`STALLED (froze at N/M frames)`. A complete dump set is still a real PASS.
+STALLED is retried once (like NO-FRAMES) before it's believed.
+
+## C — raw mouse input (`Input.MouseRawInput`, default 0)
+
+`port/src/input.c inputInit`: when `MouseRawInput=1`, sets
+`SDL_HINT_MOUSE_RELATIVE_SYSTEM_SCALE=0` and
+`SDL_HINT_MOUSE_RELATIVE_MODE_WARP=0` before `SDL_SetRelativeMouseMode` —
+removes OS pointer acceleration / warp emulation from aim. Off by default
+so nothing changes unless the user opts in.
+
+## E — `--help` / `--version`
+
+`port/src/main.c`, handled before `crashInit()`:
+- `--version` → rom id / target platform / build hash, exit 0.
+- `--help` / `-h` → the above + usage + the 21 solo-level `-level_XX`
+  table (matches `tools_pc/level_sweep.sh` / `playtest.sh --list`), exit 0.
+
+## Not done (Tier 2/3 from the board)
+
+F (minidump), G (PNG screenshots), H (rumble), I/J (in-render overlay /
+toasts) — left for a dedicated session.
diff --git a/port/src/input.c b/port/src/input.c
index c6d1568e..71402e8f 100644
--- a/port/src/input.c
+++ b/port/src/input.c
@@ -129,6 +129,7 @@ static int mouseTurnSpeed = 100;    /* hipfire yaw sensitivity, percent */
 static int mouseInvertY   = 0;      /* 1 = mouse-down looks up */
 static int mouseYScale    = 100;    /* extra vertical (pitch) sensitivity, % */
 static int mouseSmoothing = 0;      /* 0 = raw; 1..90 = low-pass strength (%) */
+static int mouseRawInput  = 0;      /* 1 = bypass OS pointer accel for aim    */
 
 /* Gamepad tuning -- defaults reproduce the old hardcoded constants exactly. */
 static int padDeadzone    = STICK_DEADZONE;   /* left-stick deadzone, raw 0..32767 */
@@ -202,6 +203,14 @@ int inputInit(void)
     /* Relative mouse mode for mouse-look. ESC still quits (video.c). */
     mouseGrabbed = mouseEnabled;
     if (mouseEnabled) {
+        if (mouseRawInput) {
+            /* Feed the raw device delta straight through: no OS pointer
+             * acceleration, no warp-based emulation. Must be set before
+             * relative mode is enabled. */
+            SDL_SetHint(SDL_HINT_MOUSE_RELATIVE_SYSTEM_SCALE, "0");
+            SDL_SetHint(SDL_HINT_MOUSE_RELATIVE_MODE_WARP, "0");
+            sysLogPrintf(LOG_INFO, "input: raw mouse input (no OS pointer accel)");
+        }
         SDL_SetRelativeMouseMode(SDL_TRUE);
         /* Drain the initial jump. */
         SDL_GetRelativeMouseState(NULL, NULL);
@@ -477,6 +486,7 @@ PD_CONSTRUCTOR static void inputConfigInit(void)
     configRegisterInt("Input.MouseInvertY", &mouseInvertY, 0, 1);
     configRegisterInt("Input.MouseYScale", &mouseYScale, 1, 500);
     configRegisterInt("Input.MouseSmoothing", &mouseSmoothing, 0, 90);
+    configRegisterInt("Input.MouseRawInput", &mouseRawInput, 0, 1);
     configRegisterInt("Input.PadDeadzone", &padDeadzone, 0, 30000);
     configRegisterInt("Input.PadTriggerPct", &padTriggerPct, 1, 99);
     configRegisterInt("Input.PadLookInvertY", &padLookInvertY, 0, 1);
diff --git a/tools_pc/level_sweep.sh b/tools_pc/level_sweep.sh
index 235dce17..7a7ff090 100644
--- a/tools_pc/level_sweep.sh
+++ b/tools_pc/level_sweep.sh
@@ -66,18 +66,22 @@ run_level() {
   # known -- exit as soon as the whole dump set is on disk (PASS), or the frame
   # count has been frozen for STALL_SECS (level rendered a bit then wedged), or
   # the process exits on its own (clean exit / crash).
-  local waited=0 fcnt=0 prev=0 stall=0
+  local waited=0 fcnt=0 prev=0 stall=0 stalled=0
   while [ $waited -lt $SWEEP_SECS ] && kill -0 $pid 2>/dev/null; do
     sleep 1; waited=$((waited + 1))
     fcnt=$(ls ppm/*.ppm 2>/dev/null | wc -l)
     [ "$fcnt" -ge "$EXPECT_FRAMES" ] && break
     if [ "$fcnt" -gt 0 ] && [ "$fcnt" -eq "$prev" ]; then
-      stall=$((stall + 1)); [ $stall -ge $STALL_SECS ] && break
+      stall=$((stall + 1))
+      if [ $stall -ge $STALL_SECS ]; then stalled=1; break; fi
     else
       stall=0
     fi
     prev=$fcnt
   done
+  # was the process still alive when we gave up (vs. a clean exit / crash)?
+  local alive=0
+  kill -0 $pid 2>/dev/null && alive=1
   taskkill //F //IM ge007.x86_64.exe > /dev/null 2>&1
   wait $pid 2>/dev/null
   sleep 2
@@ -95,7 +99,14 @@ run_level() {
   last=$(ls ppm/*.ppm 2>/dev/null | tail -1)
   if [ -n "$last" ]; then
     pcnt=$(python tools_pc/pixcount.py "$last" 2>/dev/null | grep -oE 'non-clear [0-9]+ \([0-9.]+%\)')
-    echo "PASS  $pcnt"
+    # frames rendered then froze while the process stayed alive -> STALLED,
+    # not a real PASS (the Silo -level_20 fly-down case, D117/D134 load
+    # sensitivity). A complete dump set is still a genuine PASS.
+    if [ "$stalled" = 1 ] && [ "$alive" = 1 ] && [ "$fcnt" -lt "$EXPECT_FRAMES" ]; then
+      echo "STALLED (froze at $fcnt/$EXPECT_FRAMES frames)  $pcnt"
+    else
+      echo "PASS  $pcnt"
+    fi
   else
     echo "NO-FRAMES"
   fi
@@ -105,18 +116,19 @@ for entry in $LV; do
   name=${entry%%:*}; num=${entry##*:}
   status=$(run_level "$name" "$num")
 
-  # NO-FRAMES is the flaky outcome (D117 + host load) -- retry once before
-  # believing it. A CRASH is deterministic enough to report as-is.
-  if [ "$status" = "NO-FRAMES" ]; then
-    sleep 3
-    retry=$(run_level "$name" "$num")
-    if [ "$retry" = "NO-FRAMES" ]; then
-      status="NO-FRAMES (2 attempts)"
-    else
-      status="$retry  [passed on retry]"
-      [ -f $LOGS/$name.crash.log ] || true
-    fi
-  fi
+  # NO-FRAMES and STALLED are the flaky outcomes (D117 + host load) -- retry
+  # once before believing them. A CRASH is deterministic enough to report as-is.
+  case "$status" in
+    NO-FRAMES|STALLED*)
+      sleep 3
+      retry=$(run_level "$name" "$num")
+      case "$retry" in
+        NO-FRAMES)  status="NO-FRAMES (2 attempts)" ;;
+        STALLED*)   status="$retry (2 attempts)" ;;
+        *)          status="$retry  [passed on retry]" ;;
+      esac
+      ;;
+  esac
 
   echo "$name ($num): $status" | tee -a $OUT
 done