KERS is currently delivered "through" the engine, ie the crankshaft transmits the power through to the drivetrain.
Does that mean that in the pits they are going to have to run the engines with all valves held open? Hell of a waste of energy if so?
I'd hope not, for that exact reason. It suggests the engine will be off totally, so i'd hope the KERS could power the axle in isolation from the engine.