ORIGINAL: CrateCruncher
He wanted a faster roll rate. To me that means angular speed (degrees/second improvement). Aileron differential is great for improving tracking in turns but I don't think it will improve roll rate much.
Aileron movement that causes excessive drag is going to slow down the airplane. Instead of pulling the nose off line, if the ailerons only cause a rotation on the roll axis, that energy they create is going to go into causing the airplane to roll.