The game looks fantastic on a triple monitor setup. The one thing that I've noticed though, is that the menu background is just an image and it doesn't fill the whole screen. Screenshot attached. https://www.dropbox.com/s/jyqpspdfii9vpfi/Screenshot 2014-01-15 19.41.24.png
https://www.dropbox.com/s/09f00r04fuq0llh/Screenshot 2014-01-15 19.43.16.png Sorry, that's the only other one I have on me at the moment (I'm at work). In game is awesome but it would be nice to be able to shift where the GUI sits.
Mod Manager https://forums.uberent.com/threads/rel-pa-mod-manager-v3-0-4.50726/ The Floating UI mod thread. https://forums.uberent.com/threads/rel-floating-ui-v1-0-58197.54617/
I doubled the size of the background image by pasting a mirrored version to the right of the original. The image now has a size of 5120 x 1600, which should fit your monitors. Replace the one in <PA install dir>/media/ui/alpha/start/img with the attached one and you should be good to go. This could easily be written as a mod, but meh. I'm lazy.
Heh, I meant just shadowing the file. Actually, to test the image I just plunked it in an existing but unrelated mod so as not to harm my PA install in the process.