I'd say that you're probably dead on with that. The way I see that it'd make sense is this:
During acceleration, the back wheels would get the majority of power with the front wheels getting just enough power to pull and prevent slip at the back end. Then once the initial acceleration has been achieved, the front wheels would take over and pull the car. This would be ideal in just about all situations. When the car needs more power, full power could be given to all four motors to give maximum performance while still maintaining limited slip and traction control.