Windows adds those modes by default - these are non VESA res, but they are already selectable. I absolutely don't understand why you need "bugzilla" when no developer ever posts there. When you look over to nvidia - they put a link to
directly on the left of the download pages
and developers answer directly there (marked as NVIDIA developers). I don't think that repeating me on differnet places is needed. I create live cds - therefore creating a live environment for testing ATI bugs is realatively easy for me. If you want to try that let me know.