You shouldn't need a slider for anti aliasing or anisotropic filtering. Just go into your video card's control panel and tell it you want it. For me, I just right click the Ati icon on the taskbar, hover over the video card name, then over 3D Settings, then over Standard Settings, then click Optimal Quality. Doing so enables 4x FSAA and 16x anisotropic. ;)
Edit: I was wondering why the textures in the game looked so good and also why the fan on my video card kept getting so noisy. Not like the game ever lags though. :D