[Jeff Rodriguez]

Regardless of the electronics and whether or not it can be built, how would it work?
Would it simply resist any movement of the joysticks and push back?
Or would it push back when the robots movement is being opposed, i.e. in a pushing match with another robot? Could you do this by comparing the value from the joystick (what the robot should be doing) with perhaps the accelerometer (what the robot is doing) to come up with how much the stick should be pushing back?
If it did give real feedback, would it be useful or just another obstacle for the driver to overcome?
For example, you are face to face with another robot trying to push each other. If you have true feedback, the joystick would be pushing against the drivers movements. Wouldn't that keep the joystick from staying at it's maximum, essentially giving the robot less power and losing the pushing match for you?
I suppose that you could limit the amount of force feedback, but at what point does it just become a nuisance?