This is a TEST. I'm perfectly aware that this game does not support widescreen|multihead (yet?) …or Linux PC at all.

And yet here I am. Edited GameUserSettings.ini and Settings.ini in compatdata/1646850/pfx/drive_c/users/steamuser/AppData/Local/SB2/Saved/Config/WindowsNoEditor to get here:

GameUserSettings.ini:ResolutionSizeX=5760
GameUserSettings.ini:ResolutionSizeY=1200
GameUserSettings.ini:LastUserConfirmedResolutionSizeX=5760
GameUserSettings.ini:LastUserConfirmedResolutionSizeY=1200
GameUserSettings.ini:DesiredScreenWidth=5760
GameUserSettings.ini:DesiredScreenHeight=1200
GameUserSettings.ini:LastUserConfirmedDesiredScreenWidth=5760
GameUserSettings.ini:LastUserConfirmedDesiredScreenHeight=1200
Settings.ini:r.setres=5760x1200w

The maximum that the game allowed me was 3840x1200. I did write protect the files in the end to make the config persistent. Most UI elements center so it's playable.