I'm using v-pulleys and chain, yes - keeping it simple. I'd like for folks to be able to do the same to their mobies with relative ease - a bolt on conversion, if you will!
Regarding the freewheel - Karen's bike uses a centrifugal clutch / variable diameter pulley on the rear (1/2 of a CVT system from the original drivetrain) and a fixed pulley on the front. As a result, she doesn't have a "freewheel" per se, but I think would be able to walk the bike around without the motor turning. Also, on take off, the clutch will be providing some slip, reducing starting current or at least damping it somewhat. However, the rear pulley will always be trying to change ratios...
I would think that a freewheel would be ideal for maximizing range, but am not sure how to incorporate one into my bike's driveline.
Do you find yourself coasting very often?