diff --git a/testing-checklist-5.1.0b1.txt b/testing-checklist-5.1.0b1.txt
index 08084efd..33a42fe3 100644
--- a/testing-checklist-5.1.0b1.txt
+++ b/testing-checklist-5.1.0b1.txt
@@ -1,4 +1,4 @@
-Testing Checklist -- eaa5fd3 through 2026-07-19
+Testing Checklist -- eaa5fd3 through 2026-07-23
 Branch: 5.1.0b-in-progress
 Last known-good pod test: before eaa5fd3
 ================================================
@@ -53,3 +53,57 @@ Last known-good pod test: before eaa5fd3
 8. SOURCE ENCODING / BUILD HEALTH
    [ ] Full Release build completes 0 errors (the min/max fix was the last issue)
    [ ] No new warnings introduced beyond the pre-existing 384
+
+------------------------------------------------
+Added 2026-07-23 (commit 5813aeb6)
+------------------------------------------------
+
+9. ROOKIE MISSION -- CONFIGURABLE DEFAULTS VIA options.ini
+   These defaults are read by CTCL_SetCDSP at startup and exposed as gosScript
+   globals (g_szRookieMission, g_nRookieGameType, g_nRookieTimeLimit, etc.).
+   The console script reads them instead of hardcoded values when "Default" is
+   clicked or when the Rookie mission auto-loads.
+
+   [ ] Without [RookieMission] section in options.ini: Rookie mission defaults
+       to "ScarabStronghold - Attrition", game type Attrition, unlimited ammo on,
+       all other params at zero/off -- same behavior as before
+   [ ] Add [RookieMission] section to options.ini with MissionName and GameType
+       overridden; restart game; "Default" button in console loads the specified
+       mission and game type correctly
+   [ ] TimeLimit=-1 in options.ini: lobby uses the server's default time setting
+       (g_nTimeList_Value); TimeLimit=5 sets the lobby time limit to 5 minutes
+   [ ] All 12 overridable params work individually: Visibility, Weather, TimeOfDay,
+       Radar, HeatOn, FriendlyFire, SplashDamage, UnlimitedAmmo, WeaponJam,
+       AdvanceMode, ArmorMode
+   [ ] Game launches and functions normally when [RookieMission] section is absent
+       (no crash, no STOP on missing keys)
+   [ ] Requires rebuild: MW4.exe (Release + Profile); ScriptStrings.dll
+
+10. MECHLAB -- TURN RATE LABEL (StringResource.rc)
+    IDS_ML_CH_TURNRATE changed from "Turn Rate (Degrees/Sec.):" to
+    "Turn Rate (Top Speed Rad/Sec):". ScriptStrings.dll must be rebuilt.
+
+    [ ] In mechlab, the turn rate stat row label reads "Turn Rate (Top Speed Rad/Sec):"
+    [ ] No other mechlab labels affected
+    [ ] Requires rebuild: ScriptStrings.dll (part of normal MW4Application build)
+
+11. HSH ASSET FILE RENAMES -- MFD AND MECHS PORTRAITS
+    Several hsh/ BMP files were misnamed relative to what the game loads.
+    Filenames now match the canonical stems used in huddamage.cpp texturename[]
+    (hsh/MFD, hsh/hud, hsh/radar/hud) and GetLocString DNL strings (hsh/Mechs).
+
+    hsh/MFD/ -- in-game target MFD damage display (uses texturename[] canonical):
+    [ ] Assassin II: MFD shows correct silhouette during combat
+        (was assassinii.bmp, now assassin2.bmp -- matches M_Assassin2 entry)
+    [ ] All other MFD silhouettes display correctly in combat for all 65 mechs
+        (bulk refresh from 5.0.7D release; verify no missing/black MFD panels)
+
+    hsh/Mechs/ -- mw4print post-match scorecard portraits:
+    [ ] Print a post-match scorecard featuring a Battlemaster IIc pilot;
+        portrait image appears (was battlemasteriic.bmp, now "battlemaster iic.bmp")
+    [ ] Print a scorecard featuring a Behemoth II pilot; portrait appears
+        (was behemothii.bmp, now "behemoth ii.bmp")
+    [ ] Print a scorecard featuring a Mad Cat MKII pilot; portrait appears
+        (was "mad cat mk.ii.bmp", now "mad cat mkii.bmp")
+    [ ] Scorecards for all other mechs still show portraits correctly
+