pcsx2 0.9.7 mac even when that comes would still use the same controller plugin. And I haven't started porting 0.9.7 yet
I Haven't had any issues with my dualshock 3 controller. Are you using it via usb or bluetooth? The cool thing about SL is that it has drivers built in for the controller natively. Which is one of the reasons I'm really excited about 0.9.7 for OS X, I'm sick of using the cumbersome motioninjoy drivers on windows. It's reaaaaaaaaally frustrating. Either way PCSX2 Quartz is able to find it and use it without flaw, even on bluetooth.
Speaking of which, is there even a rough guess on the release date of 0.9.7? I seriously can't wait for it!