@Reconnoiter: In my opinion, capping the mouse speed in a first person shooter is a big no-no
especially because the cap in mouse_force is really low.

I rarely use mickey.z (mousewheel) so I can't confirm this problem.
However, mickey x and y have never caused me any trouble as far as I remember.

Edit: oh, but I know that keys remain pressed in an 3dgs application when changing to a different window and back or tabbing out and in again.