a 1st gen mr2...if they are too close to heel-toe, try the rolling technique. this can also be used in hondas.
simply keep the inside of your right foot on the brake, while keeping the outside of your foot on the gas. when youre heading into a turn, press down on the brake, and roll your foot on the gas to bring the revs up so you can match the speeds. the inside ball of your foot should act as a balance point, given you have proper shoes on. but then again, who would go out racing with some big, heavy, wide shoes anyway? (good shoe for racing while still lookin clean is the vans rowley 2. gives you nice pedal feel.) just drive around back roads practicing this, over time you will get better and it will just become second nature.
in bimmers you have heel-toe very well, but i found its kinda difficult/awkward in honda. i just roll my foot from either pedal.