Well, I managed in the end to make it work with AA and AF. I turned them off from LFS and turned them on in nHancer. So with AA8x/AF16x on a 8800gt this is how it looks. But sadly a major fps drop, from 220 to 120.
LE: Just with Bramski files, not any tweaks.
Hmm, I have some issues. It's a difference of 10 fps between driver and game AA and AF, and i think the quality of the driver settings is better. The driver is 174.20, the videocard is 8800gt. Here are the images: