I also have a 6935g with 512mb 9600, adding your string to the boot.plist worked fine. but ive noticed that a few people have mentioned having full QE CI support. when I check mine in "about this mac" there is no mention of Quartz Extreme or CI, i remember on 10.5 and below it used to say supported or not supported.
I'm asking because I installed oblivion and It seems to be working fine except for no 3d graphics, the hud is there the cut scenes play and i have audio?? I can hear footsteps when i use the arrow keys.

I was planning to use this as my primary operating system but I cant with no 3D

Any help would be nice, thank you