Current problems that I see with Arma II in terms of mouse controls are:
Forced X axis negative acceleration.
Forced Y axis positive acceleration.
As well as no apparent way to fine-tune the mouse sensitivity via decimal format. (e.g setsensitivity = 3.2342342)
The X and Y do not even match (probably because the X axis is affected by neg. accel and the y axis pos. accel)
In Arma III will we have much better mouse controls? I would really like mouse controls like counter strike or quake, where you can adjust your own accel values, mouse sensitivities, etc.