instead of doing fiddly stuff with the advanced physics and server configs, couldnt there be a mutators button when you start a new game so that you can set the server so that balls make you bounce and things for making jump severs so that its all just alot simpler. you could keep the adanced physics but the mutators would be a bit more like presets
another point with this is that you could use mutators to experiment with diffrent game modes more easily and there could be servers with one particular mod on.
this would probably be hard to make though