Simulating changes in gravity

[Adrianis]

After experimenting around with this a bit I have found one problem: air friction. Although an object might ignore gravity, it still slows down due to air friction. Does anybody know where the config files are for air friction controls (assuming there are any?)

Never really considered that as the object would slow down in an environment with atmosphere. I doubt there is, but I'll let you know if I find a way of doing it. Likely there would be some performance issues having an entity never stop moving, but on a small scale shouldn't be too bad.