[Brdn666]

You could program so "electric gears". Just have 2 or 3 settings that subtract from your joystick output. To get the buttons to switch without holding the button down, get three selects (programming/comparison). Wire the bottom's select into the false of the one above. Repeat, wiring the very top to the bottom (A feedback node should appear). Put the buttons select into the select, and then put whatever values you want in the true. The output of the top goes into your add/subtract and the joystick goes in the top. Put in a catch for when you add/subtract too much and go backwards when you aren't moving at all.