Rules I can't find

[IronicDeadBird]

I'm not exactly sure where to look in the manual for where I would find rules on what we can and cannot do with Joysticks and Gamepads. I know a team last year correct me if I am wrong designed and made their own interface for controlling the robot it was like a classic Arcade box with buttons and a joystick it looked really cool. In regards to making a device to control the robot where would I find rules on what you can and cannot do?
I promise I don't want the Wii U gamepad as the controller I swear...