These are handled differently, they are hardcoded constants. I think it is best to leave the constants the same. Most reactions aren't designed for higher limits, and I could see a few reactions / physics breaking if we allowed lowering the temperature limit below 0K (below 0K would also probably break the save format and a lot of other things that expect temperature to always be positive)

The ambient heat thing was trivial because it was just a single line of code with the number 295.15f before. MAX_TEMP wouldn't be overly complicated to change (not like XRES/YRES levels of difficult making it changeable at runtime, which would be extremely difficult). Maybe a mod can do it yes, but I don't want to do it in my mod either.

Also this is the correct section already, since suggestions go into feedback.

Locking because rejected, and I don't want to argue with an unmoving wall later anyway.