I tried the ds3.csv and didn't really get that far with the GRID 2 full game. This includes both in Steam Big Picture Mode and outside of that mode. In Steam Big Picture Mode The QuadStick is recognized as a PlayStation 3 controller but it still doesn't do anything when I launch the game from within that mode.
I did notice that whenever I switch to the ds3.csv profile the QuadStick disk image on my desktop disappears and I get the "a disk has been ejected improperly" warning. Switching back to any of the other profiles I use brings the disk image back and everything works as before.
There's always a chance that I'm missing something though. Bare in mind I've never even used in modern controller, or really been around them. When I was injured back in 1985 I had an Atari 2600 which used that simple joystick with a single red button. Obviously game controllers have become quite a bit more sophisticated since then. I really didn't even know what a "D-pad" was before this. So even if this worked "plug-and-play" right out of the box as a Duel Shock 3, or whatever, it would have taken me a while to figure it out. So once again, there's always a chance I'm missing something.
And of course this could simply be a Macintosh thing. People obviously use controllers to play games on the Mac, as evident in that link you sent me from Feral Interactive's (a Mac game porting studio) GRID 2 support page, but there still might be something different which makes the QuadStick controller profiles not function.
Perhaps there's some third-party workaround. I think you and I already discussed this when I initially got my QuadStick; I will take another look at this now that I actually have a genre of games (racing games) I would need to figure this out in order to play.
But even if this can't be solved I don't want you to lose sleep over it or anything. There's plenty of other types of games that I can play with the QuadStick, some of which I couldn't play before with my Headmaster Plus, so I will live with it. Plus if I really want to so badly I could always just simply purchase the PlayStation 3 or 4. The perils of gaming on a Mac. :-)
I'll keep you posted if I discover anything useful. As usual thanks for your help. :-)