The tools we would be using are ISBoxer/Innerspace, and possibly a dummy plug. (making a dummy plug here: http://www.overclock.net/folding-hom...ml#post4538942 )
Now, I'm not at all sure if you'll actually need the dummy plug, but when using folding at home on extra GPUs/dual-GPU cards where you don't have extra monitors it would trick your card into thinking a monitor is attached. You might not need it, but if you can't defer rendering of other clients to isboxer/innerspace without it, try with and see what happens.
http://isboxer.com/index.php/compone...le-video-cards
While that says you must use monitors, I'm sure in innerspace you can still make new profiles for games and assign them to different GPU cores. I'd got into more detail now, but you get the gist, right?