I was thinking that if you made a vehicle that moved the same way the player did, but moved around like the gravity jeep, you have "antigravity" really easily, at leas the model can turn. Without crouching but that's very minor, and might be fixable, I don't know for sure. You could even set the map's density to the same as the player (as in space maps), creating zero gravity, then use scripts to set velocity of the player and such. Could be interesting if somebody pulled this together.
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