I have a GeF4 Ti4400 and Rice's plugin is working pretty much as advertised for me. Yoshi's Story works great. Ogre Battle too. Haven't tried Banjo Tooie yet but according to the readme it takes a little playing around to play through, but its playable. Anyway its not just GeF2 users who have been able to use it.
I haven't installed the new 30.82 drivers yet but its on my list of things to do tonight. Some others have reported increased compatibility/performance. Might help.