PQ3:
Yes, indeed, but I thought you didn't get it to work, because you said "However, I didn't find any debug menu ."
PQ4:
There isn't a PATCHES directory at all in my version. I've tried to delete other SCR files, but nothing happend (the game would run normal). CLASSES does nothing... Pressing SHIFT-SHIFT-MIN crashes the game, instead of just displaying "Oops, you did something... etc. " (with SCI1 games). I don't have a clue how to get the version, it most likely the first release of PQ4, on floppy disks... It's 20.455k... And it's SCI32 i presume, bundled with that (at that time) very common DOS4GW extender...
Now, I wonder if anyone checked the rare SCI version of Mother Goose, since I think that one still contains a debug mode... I was checking a savegame of MG, and found strings like:
vanishingX: vanishingY: About game ^a Help #1 Game Kids #5 Disk #7 Speed Change... ^s -- Faster + Normal = Slower - Sound Volume... ^v Sound Off #2 1 Debug Game`^g :Cast`^c :Ego`^e :Memory`^h :--! :Visual`@v :Priority`@p :Control`@c :--! :WriteEgo`^w :Set Debug`^D Cheat Teleport`@t :Room num`@r :Input`@i :Set Vanish`@y
After disassambling the scripts, I guess that SCRIPT.997 controls it, however I don't know if this is the SCI0 debug-mode you all talk about...