On the whole mouse accel issue, I should be clear:
If I had never had bootcamp set up, and had only played sc2 under osx, I wouldn't have even considered the issue of mouse acceleration and I'm sure I'd be playing just fine.
However, I do a lot of my gaming under bootcamp so I set up sc2 there as well; and once I played around with all the mouse settings I found that, although I could adjust to playing under either os, I prefered the behaviour of the mouse under Windows. (Before anyone asks, I did play with USB Overdrive and all the other purported "this turns off mouse acceleration under OSX" options).
I don't think it's a major issue, but I am now very much acclimatized to the Win mouse and it suits my play. I find I am less accurate under osx. I'm sure, if I had been playing instead under osx all this time, I would be much better with the OSX mouse behavior. Whether either is obvjectively superior - well, I've read some fairly convincing-sounding arguments about 1-to-1 pixel-perfect control or whatever, ultimately it's a matter of what you the player prefer.