Just a total SWAG here as I haven't looked inside of the controller but I'd bet that the gimbal wheel is a three wire device. Swapping the directional wires on the switched potentiometer would have the effect you're looking for. If the gimbal wheel is hardwired to the controller board, it would take a bit of fine pencil soldering skill to achieve OR a couple of seconds to add in some quick connects to be able to go back and forth easily in the case your friend wanted the wheel in original configuration.
DAFlys Posted at 6-12 00:04
I agree, its been suggested before but nothing came of it. I keep threatening myself to put a label on it.
At one point, i also thought of putting a label on it. Now when i want to pan the camera up or down, i just think of a push-up and it quickly reminds me how to properly operate the gimbal wheel.