Totally disagree. (Though I can understand why some people prefer mouse accell.) Mouse accelleration is the worst thing possible for all of the above. What you want is super high sensitivity and zero mouse accell. Then your muscle memory knows exactly how far to throw and you only have to throw a very short distance to do a full turn. Aiming becomes a fine control art but you will learn it with time. The way to do this is to play for about 10 hrs at one sensitivity and then slowly increase your sensitivity in little chucks until your pratically off the chart.
That's the perfect way to lose
. Quake Live strafe jumping requires fine movements for maximum speed, and if you increase the sensitivity, you essentially increase the angle that one count of mouse movement results in.
Increase it too far, and you can visibly see your camera glitch from one angle to the next, even if you only push the mouse by a single pixel - this is because you increased the multiplier (sensitivity) so far. And this is why professionals almost all use acceleration (I'm not daring to speak for everyone, but I personally haven't seen a pro without
). If you remove acceleration and increase the sensitivity, you will never be able to move at the speed of the best players. Ever.
Here's a demonstration from one of the top players today: http://www.youtube.com/watch?v=MgMAZvtd1ec
Skip to 3:50, because there's a lot of nonsense and talking in the first half of that video. Both players use acceleration, and you can clearly see it too: fine aim every time when it matters, and agile running/jumping maneuvers every time they're not fighting.
High sensitivity ruins your aim and also fatigues your hand muscles very fast if you try so much as just aim properly at something.
Muscle memory learns acceleration too - before long, you will know from your gut just how fast
you have to flick to get a desired movement. Acceleration is not haphazard, it's just as predictable as anything else. And for everything else, like fine aiming, you can maintain a relaxed hold (no stress on your hand) and high precision if you use an accel setup.