After rummaging all the way through the INI files I managed to disable VSync and mouse acceleration, vastly improving the mouse control. On the other hand, I am still having trouble with looking up and down in the game, for the reason that the vertical mouse sensitivity is only about half or less of the horizontal sensitivity. This is driving me nuts. In the gameplay settings menu there is only a single mouse sensitivity slider and the alternative to invert the vertical mouse axis. Has somebody establish a INI setting to have the same sensitivity for looking up and down as for looking left and right? The game seems to be excitement, nevertheless with this odd mouse control I cannot actually play it.