I have it set up exactly like this. But when I load up GTA IV and try to use it, it doesnt work at all. I go into the controller option in the game to make sure controllers are enabled and they are. And it just shows me an xbox controller and the control lay out.
Just followed the steps, and with a little trial and error got it working. Thanks for your help. I now switch from the PS3 controller to keyboard. Its more fun shooting up the place with the mouse, but everything else feels good with the Controller.