How do I get usb actions to cause keyboard actions?

[jason]

I have a gamepad and I have been playing with usbhidaction, but I don't 
know how to get it to send keyboard events.  Say if I was playing super 
tux and I wanted my game pad a button to be mapped to the jump key on 
the keyboard?  Has anyone done this or know where I should look for 
information?  I read a post about using xvkbd, or something similar, but 
I can't find it.  I tried snes9x with the joystick options but it does 
not recognize the inputs.  I successfully used my gamepad to change my 
volume and all that stuff from the man pages and default included files.

Jason