You call that roll? I'll show you roll:
Or watch a well driven current gen Miata at full toot. Tons of body roll, yet the cars manage to be super fast at autocross.
Roll isn't necessarily a bad thing, means your car (and the driver) is generating grip. Inside tires aren't doing much of anything anyways, as long as you're not roasting the inside rear on corner exit.
Stiffer speeds rate of weight transfer, and creates less total roll which may keep a tire in better camber range, but it's not always better.