Some people here don't like my what-if questions but
Ain't that what supercars are about? Doing the previously impossible?
If I posted about an aero brake some people here would have laughed loud. But now it[s a Bugatti Veyron feature.

Anyhow

What about a car with a separate brake pedal only for the rear wheels?
With a booster and hydraulic brakes.
This would make handbrake turns (immature but really fun) really easy.

Maybe even a another pedal for the front wheels?
For burnouts and close radius corner drifting.