I use a controller to drive the V3S. When I used an Xbox controller, the forward wouldn't work. I could back up, I could turn, I could call up the contextual menu, but I couldn't drive forward.
I then tried a Motionjoy PS3 controller (which has worked in the past) - and same issue. I was able to map all the assignments to the controller, but forward wouldn't work, neither would fast forward or Turbo. (Also, More Right and More Left... I don't know if those are functioning on the V3S at the moment.)
The only workaround I had was to map a controller button to a keyboard press ("W") and use that to accelerate.