from what i had read in various sources, the CVTs life span is reduced in direct relation to the additional strain you put into the tranny. if you use a power adder to double the output of the motor, you half the lifespan of the tranny.
personally i don't like the concept, and it would freak me out to floor it and hold 6500rpm (or whatever) for more than a few seconds. but it does open the door to a motor built for specific efficiency, like a generator or refridgerator, and then apply a variable gearing as was mentioned above.

and i got really bored one day and got a prius in GT2, drove it in reverse at 114mph... wonder if that translates to real life... the meter maids in dallas i saw drove prius(es?), maybe i should have asked if i could borrow one.