Yep! KERS would absolutely love four wheel drive, especially if most of the energy could be harvested from the front wheels, and then delivered from the rear.Cosi, yes, interestingly KERs would surely be much more effective if the cars were 4 wheel drive, then we could really exploit the development of KER systems, would that improve the entertainment value whilst retaining the unique authenticity of F1 engineering, maybe a step too far, eh.
This would balance the tyre wear far more between front and rear wheels, but of course would require a significant change in a car's weight distribution, as well as reducing its top speed, since all transmissions of power involve losses. Then again, four wheel drive would further increase cornering speeds once a balance is found, probably resulting in cars pulling a crazy (and rather unhealthy) 6G!