I don't know if this will work for you (not sure about the mouse problem), but you might try it from within the game. Enable the console (if necessary) on the Game Options screen - bottom right. After switching to the higher rez screen, from the game console (~), type:
r_width X (enter)
r_height Y (enter)
where X = 2560 & Y = 1440 or choose the resolutions you want.
Stephen A. Hornback
Last edited by PixelLord : 04-22-2014 at 03:22 PM.