+1 a sprint booster or other throttle remap makes the throttle more twitchy sure, but the big difference for me is that when I do a quick stab of the gas pedal to downshift, I actually get a damn blip.
Between the drive by wire delay and the standard e46 eco throttle map you really have to punch the pedal and hold it for half a second to blip the throttle for downshifting. That ish drives me crazy.