It is probably possible to turn of Anti-Aliasing system wide...
but I don't know if what you linked does that or not.
More invasive makes it more likely to trip anti-cheat and anti-virus.
It also makes it a bit fragile, for example it won't work on some versions of Windows.
I've done size-able windowed modes for games in the past... I currently have no interest in doing that for war2. DxWnd is probably the best bet for that.
The banner bug might be fixed. Not having the screen in 8bpp should prevent a lot of outside interference. Also not using ddraw's 'built-in' 256 colors compatibility hack might help as well. I'm too lazy to setup a pvpgn server to test.
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