Well my car is pretty low, but I was wondering if I raised it up a bit say for it to have a +1 finger gap, would it affect the bodyroll/handling a lot? Because I have to go so damn slow over bumps and I scratch everytime I take my car into the garage.
"alot" is a subjective word. Higher car, higher center of gravity. Also if the front is lowered more then the rear or vice versa (also applies to left and right), the weight of the car will be shifted.
but yes, your handling will be affected. Alot? Depends on what you call "alot."