O'yeah! Come on - some guru has to respond to this quiry. At least say OA CANNOT BE RUN ON A JOYSTICK!
Joysticks work in Quake3/ OA but the support is really clunky. Using a dual shock 2, I find the easy bots to be quite challenging. I can't recommend it at this time.
If you use Windows, a joystick mouse emulator may do what you want.