Exactly, jacking up your sensitivity will help in short combat situations due to the fact that you can turn faster, but the farther away the enemy is you are shooting at, the slower you need to be able to move the crosshairs. With high sensitivity, I find it hard to be accurate aiming at someone running perpendicular to me at a distance when I just need to slowly be moving my crosshair left to right. I get more kills from a distance than I do at short range and that is why I leave my sensitivity at 3. However, some of you guys might find that you ARE in short range situations more often, then yes, I advise you to experiment with your scroll speed because an increase might be good for you.