will widescreen support be added?

I’d like to play in fullscreen mode, but currently cannot due to a good part of the screen being cut off

rearranging the GUI is a huge job, so there are no immediate plans, but almost all monitors should have a setting that forces even fullscreen games to be shrunk to fit properly in the screen rather than chopped off. Make sure you have the latest video and monitor drivers (not just generic monitor ones) and you should be ok.