Map size can be customized via maps.cfg file - if you look closely at the picture in my previous post you'll see that the map actually displays in 1024x768 with part of it covered by the grey area on the bottom which prevents from using full screen.
So far I've managed to expand the map vertically by about 30 pixels to make better use of the avaible area. I've also made the map tools bar, chronometer and compass rose hide a bit further.
Default map:
Expanded map:
