Low priority request, but it’s a no-brainer that if the system has a second monitor it could be used for 2P’s view. From a limited experience with some other games it could be as easy as setting window size to entire desktop area, but unfortunately that didn’t work for me with SD.
What I tried:
Setting resolution of combined screen area in the registry has no effect;
Resizing window at runtime with SRWE didn’t work: window blinks at chosen size but reverts instantly;
AMD Eyefinity is inconvenient and sometimes hangs.