But they do fix bugs (like the broken doors or all sorts of recovery bugs) and add more optional capabilities (like MP3 music, a button to toggle double speed, or even remapping controls and mouselook). By the way, I'm quite wondering why do you still stick with vanilla. Having the bugs fixed seems to be a good thing, doesn't it?

Anyway, this reminds me of that custom Linux distro for playing all those old games that I wanted to make ....