Playing the game with Wingman RumblePad (OS X / Mac)

I would like to know how I can connect my Logitech WingMan RumblePad to my Mac so I can play TF2 with it, using CoD-esque controls (Left Thumb = Move, Right Thumb = Aim). I have tried editing the joystick.cfg file, but that didn't seem to work — am I possibly missing something?

I have tried external applications like USB Overdrive (which works, but it flips the thumbsticks for me), ControllerMate (which doesn't let me control the mouse without registering), and GamePad Companion (which also requires registration). I would like to find a free alternative, if possible; any suggestions?