The only drawback I can see to this system is that you can't spin the pedals backwards while coasting. I do this a lot to stretch my legs and just to pass the t

The only drawback I can see to this system is that you can't spin the pedals backwards while coasting. I do this a lot to stretch my legs and just to pass the time on hills when I don't feel like speeding up. Peddling backwards will engage the forward motion "but along a miserable curve".