Go to: Documents\My Games\Rise Of The Triad\ROTTGame\Config
Open ROTTSystemSettings.ini, hit CTRL+F and search for Resx
You'll find the following lines:
ResX=xxxx
ResY=xxxx
Change these numbers to the resolution you want and save the file.
The game will now launch with the new resolution, but will still only show the same limited options in the drop down menu. If you accidentally select Apply Settings in the Video section of the Options menu, it will revert back to single screen resolution and you'll need to edit the .ini file again.
Hope that helps!
Oh and thanks to HaYDeN for the quick FOV fixes!
Hopefully you'll find a fix for the HUD issue too so I can stop being so paranoid about my health all the time