Unreal 3 Engine Settings

Currently, a majority of my PC games are based off the new Unreal 3 Engine. I was wondering if there are any settings that I can change either in game or via a config file to improve the graphic quality of my games.

For instance, R6V doesn't allow you to set the AA and AF in game. I would like to try to max them both out and try the game at 1900x1200.

I would assume that based on most of my games being built off the same engine, the overall settings and configs would be the same.