One thing I have noticed, while watching BM coming into infield finish of the Baja 500. It looks like his truck has lots of under steer going through the corners. Maybe its setup or driving style, but the truck seemed to push the front tires through the corners. If you compare to a pro-4, you can see them pull through corners, not that the TT looked like. My belief is that having front wheel delivering power is not an advantage enough in itself. Proper setup with the front wheels pulling is another story.
I do also think that adding some front traction will reduce the wear and tear on rear drive components. Weather that be from lower strain on the rear drive, or being able to run at a faster pace with less input, I don't know.
You know the Australians would buy a few. As mentioned sounds like a rally rig.