I see that the problem ticket regarding no support for 5:4 monitors (1280x1024) has been marked "Not a Problem" - okay, I understand. This is conjecture since it hasn't been explained exactly why, but my guess is it would cause problems regarding Field-of-View and such, which uneven the playing field.
The current behaviour of running in fullscreen with the lower resolution, 1280x960, stretches the window to fit. On its own, this is not desirable, but to make matters worse this causes odd banding, or random bars to appear on screen as the refresh rate goes wonky.
Please add the option to let 5:4 users set their game to 'letterbox mode' so the game isn't stretched. The image is an example of what I mean.