Was digging thru the notes made for The Brethren, and came across this:
Automatically center and size the MxO map:
1) Open the Map [M] and drag opposite diagonal corners to the corners of the screen, so that the map covers the entire screen. Close the Map [M]
2) Press \ to bring up Video Options. Choose a lower resolution than the one which you play in, which has the same aspect ratio as the resolution you play in. Standard (not-widescreen) resolutions with the same aspect ratio are 1600x1200, 1280x960, 1024x768, 800x600
3) Click Yes to accept the new resolution before the 12 second timer expires.
4) Open the Map [M] which will still fill the entire screen, but is now fewer total pixels. Close the map [M]
5) Press \ to bring up Video Options. Choose the resolution which you normally play in. Click Yes to accept the new resolution before the 12 second timer expires.
6) Open the Map. It is now perfectly centered with equal borders around the screen.
If the Map seems too big, repeat the steps except choose a lower resolution in step 2.
Hope this helps some Redpills!