No, Andre, I don't have GT2. But I do know how I set up my controller. I set it to Digital Only in the config box, then I pressed dfault which sets all the buttons to keys and Dpad directions keys also, I then exited and went back in, after going back in, I was able to set all the functions to the buttons and on the d-pad it was set to up, down, left, and right. All the buttons have a J1 in front of them and the directions as well. Examples: J1 B8, J1 Up, etc. Again, make sure that it say Digital Only, not something else like Digital/Analog. I checked my cofiguration so I know this is right.
As for it working w/steering wheels and the like, I'm not sure. You would have to try it and see for yourself. Hope this helps.
sincerely,
sx/amiga