I quickly modded gltrace to create an opengl32.dll file that overrides alpha-test calls with alpha-to-coverage. Dumping it into your game's folder should make alpha tested textures look nicely antialiased with multisampling.

Download here:
http://www.humus.ca/Cool/GLOverride.zip

Feedback is welcome. I've only tested with UT and UT2004, but it seems to work very well most of the time. This is just a quick hack, so I've hardcoded a 6x multisampled pixel format, which will probably break on anything but ATI.

If there's enough interest I'll make a proper solution and add more options to it.

Více zde
http://www.rage3d.com/board/showthread.php?p=1333778142

a zde
http://www.rage3d.com/board/showthread.php?t=33820324