Of course, the official word from Rockstar is it is due to over-sensitive mice.
The official word from Rockstar is the game was written for "Future PCs". In the future of course, PC's won't have SLi or Crossfire, which is why performance is so poor, even on powerful current generation PC's.The real deal is this: GTA: IV is unfinished. It was rushed for Christmas. Even the Installer boot-menu thing doesn't work properly, it just prints gibberish (presumably due to me having a non-English version of Windows).