pls do yourself and everyone a favour.... dont do anything you just mentioned cuz it will kill the tranny big time and thats big $$$$
if you seriously want to shift while racing (on the track of course
) your better off buying a standard cuz in the long run it will make more sense to drop a couple of g's into another car than it is to replace the busted parts.....
but if you really want to race in an automatic... the best way to do it is keep it in D and press dwon on the brakes... at the same time step on the gas at high rpm's then just release the brakes.... you'll be up in that power band..... but its still not good for the car.... once in a while is not as bad tho....