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If you did want to try a hybrid, with one engine and one electric motor on each pair of wheels,
I would put the electric motor on the set of wheels that can be "disconnected".
If you are using a brushed DC motor, you are always going to have wear on the brushes and bearings, and (possibly) could even blow your motor from it spinning from being pushed around by your gas engine.
If you used a motor, such as an AC or a shunt-wound DC, you could rig up regenerative braking as well.
Another thought on the Open ReVolt controller - since it is so reprogrammable, the software could be custom tweaked for Hybrid use, instead of EV use. The EMIS system uses a "black box" that takes information from the OBD2, and feeds it to the EV controller as throttle information. That way, you only use just your existing gas pedal to control the car. I'm sure something similar could be done with the ReVolt.
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