Good idea, but the problem is gearing. At 50mph it is reving quite hard - I though something might melt! I do have the road gearing which will let it cruise at 50mph, but then 1st gear is way too high for decent off road hill climbs - so it seems I need a 13.5 tooth front sprocket.....or a smaller rear sprocket.
I also tried lying down flat with my head over the speedo, but that was 5mph slower than with my feet up on the crash bars. I also seemed to wobble quite a bit in that position too, but was much easier to control the wheelstands.
By the way I am NOT related to the Michelin man even if it looks like a genetic match in the photo!