Ok some more info I should have looked up

Manual
Quote:
Global antialiasing settings in the 3D card settings menu will make panels and bitmap fonts look blurry, depending on the 3D hardware and driver version. Use only d3d_antialias for scene antialiasing.

http://www.conitec.net/beta/apanel.htm

Now I can assume somethings. Panels are created with dx9 function. Direct_3d because direct_draw was removed. To get a good understand I'd have to ask the dev. There are some flag like settings I found looking up d3dx9 and maybe this filter flag is just on of them. I assume we can access dx9 so should be able to it turn a anti aliasing for d3d quid. But I'm all guessing
This 'doesn't seem to apply https://msdn.microsoft.com/en-us/library/windows/desktop/bb173422(v=vs.85).aspx
Possibly helpful -> http://www.gamedev.net/topic/504543-antialiased-text-rendering-d3dx9/
possibly helpful ->http://stackoverflow.com/questions/13912482/turn-on-anti-aliasing-in-d3d9
Helpful??->https://msdn.microsoft.com/en-us/library/bb219690(VS.85).aspx
Maybe HelpFul -> http://sofb.developer-works.com/article/24817283/turn+on+anti+aliasing+in+d3d9%3F