[rswsmay]

Not only is labeling your wires not illegal, I personally highly recommend it. Especially when you have up to 10 motors, several pwm extension cables, Y-connectors, sensors, etc. They can get pretty mixed up if you have to make some changes on the fly. We usually use a small piece of masking tape to mark which motor, or interrupt or IO port they plug into.

I would also suggest that you label both of the yellow receivers. When you plug-unplug-plug-unplug them in and out going back and forth between crystals and tethers, you could mistakenly plug receiver 1 back into port 2 and vise versa. Your driver then ends up controlling your manipulators with a remote that has been pre-trimmed out for driving, and your operator is now the driver with his remote setup for your manipulators.

This could be very frustrating during a match, and very embarrassing afterwards when you realize what the problem was. Trust me, I know from experience.