Oooookay, bbman, that was slightly misleading
Never had, doesn't have and never will have KERS is correct.
But yeah, in a game it's just a push to pass button. In real life it's a step to a lower fuel consumption and stuff, but since we have virtual fuel and all of that, IMO we really don't need KERS. As it was said, it'd be just like a rechargable NOS. And don't come around explaining it doesn't use nitrous oxide, i'm well aware of the technologies used in a KERS (more so in a mechanical or flywheel KERS than an electrical, but it's basicly a no brainer too).