Since installing 0.9 I only changed resolutions to see how it is was like in higher res before changing back to 640x400 and left it like that for a whole year, and then after a latest nightly build I had an urge to change resolutions again and then discovered that you can't change it back to 640x400 without editing the options.cfg (which was my first though) or clicking on res numbers in video options and typing your own custom res (which I didn't know was possible until today);
The current apparent minimum is 640x480 (which IMHO is too vertically stretched), can we lower it back to 640x400?
EDIT: Corrected the numbers.