Why disable turn left and right?
Don't get it? Who found that it is good to disable turn right and left (together with look up and down) when mouse look is on?
I use both mouse look and turn left and right.
I usualy put mouse sensitivity to very low so I can be accurate when I shot, and use turn left and right buttons on higher sensitivity so I don't need to constatly move mouse up from pad and it is good when someone is behind you, since that turn speed on buttons are very big.
Hell I used this tactic in CS when I was active player...