Hi!
I own an USB-Competition-Pro. Unfortunatly right now you can only play Planet M.U.L.E. by using the keyboard. BUT:
With the following software you can map each state of the USB joystick with a key. With that you can already play Planet M.U.L.E. with your joystick:
http://www.deinmeister.de/jct_e.htmJoystickCursorTool is a small utility simulating keyboard keys using a joystick. It can be used for keyboardless navigation in browsers and file managers, playing games without native joystick support, using the joystick port for electronic interfaces without needing to write a joystick driver as well as other situations where only a small subset of the keyboard is typically used.