Okay, I was able to get more to happen in this one. The custom scripts that I'd unzipped into the Thief II folder were put into their own folder, so I just moved them out of it and sh*tcanned the empty folder. However, two of the crystals down below still don't work (ones next to the entrance/exit) while two of them do. Also, the AI spawners
spoiler:hidden above all seem to work now.
Zombie parts are still white though. Also noticed that the
spoiler:chest hidden above the glass roof is sometimes not there.
It's a shame this FM and the others like it are plagued by the resulting body count that the games engine can't handle. Would've been nice to have the bodies disappear like pieces of a broken crate or gibbed zombie.