How do I use more than one controller at a time? Since I probably can't, I suggest it is made so you can. The game has different vehicles in it, it should allow more than one controller at a time. You can't use a wheel to drive unless you have pedals that plug into it, and the same with a joystick and pedals for a plane.
Controller support has been an issue since alpha. Just last year we got slightly better support for flight sticks. Extra controller support would be nice, but I gotta say.... probably not going to happen. Ever.