Shall I let you into a little secret?
Ever wanted to get a screenshot in a resolution that your monitor/hardware won't allow?
Using the SP2 Res Fix posted here, set your screen res to (example) 2048 x 2048 in the cfg file and then run the game in windowed mode. The game will run @ 1024 x 768 but your screenshots will be in glorious 2048 x 2048.
Any resolution is supported, just crank it up.
Discovered this by mistake but apparently, is known to a few people.
You know who you are, you furry fecka!