Anyways like you said hopefully it gets fixed in vanilla minecraft, well just have to wait and see.
Btw, is this just a bug or do most people not not play in fullscreen mode because seeing as there is only one page on this thread, it doesnt seem to affect many people.
Edit: Well i feel dumb. I just realized if you maximize the screen (not F11) and then you go into fullscreen mode your mouse cursor should be centered.
Edited by dabuilder303, 08 November 2012 - 06:26 PM.