Those issues should be, as far as I've seen and read, resolved with the updated r31356 build of webkit.
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Ah, I stand corrected, the new build still has some issues, and - while being faster than the other engines (according to themselves, lol)- simply isn't fast enough yet.
-Edit-
Ah, Algor, I've found myself in the same position. I simply just don't like Safari, Epiphany or Konqueror (which all use webkit, or at least can be set to do so), so I'm sticking to Firefox and it's 54/100 score, and just hope it'll be better with FF3