Maybe I missed something in my native language, but I don't get the connection between Saner and schnell, sorry. I always read "san" and "saner" like the Englich word for a healthy mental stability, sane. Yeah, Foi and Feuer sound similar though, I agree. Other connections to German may be names like Lutz, Rolf and maaaayybeee Lena (pretty generic German names, Lutz and Rolf being rather old fashioned). But that doesn't help with the tech names. I guess some of them have their origin in existing words (regen for example, or gra for Gravity) and some may just happen to be because the devs thhought it sounded cool. Or played Scrabble. Or were drunk. Some of the monsters in PS III especially seemed to me like they had a glass of wine too much. For example the blotter (
http://pscave.com/ps3/enemies/blotter.shtml). Looked like a micro chip which the devs threw at a wall in despair and decided to make an enemy out of the remains.
Other tech ideas:
Hinas: Short of "Hinaus" (German, some kind of "get out of here", depending on the context), maybe just a coincidence.
Res: Restoration
Anti: Antidote
Gra: Gravitation
Maybe.