Baseline (Widescreen) Solution & Issues
Native Hor+ support. Tech: Unity.
FOV slider has 4 notches: 65, 70 (default), 75, 80.
You can see this value stored as "FOVMod" in %USERPROFILE%\AppData\LocalLow\Fullbright\Tacoma\TacomaOptions.json
but unfortunately, manual edits (and making the file Read-only) have no effect. The cheat table in the files available from the PC Gaming Wiki Community Files (search there) however can be used as a workaround to increase and decrease the fov outside of those 4 options plus gives extra vertical fov below 16:9 like the HUD.
The controls after enabling it are "Ctrl +" to increase fov and "Ctrl -" decreases it.
Ultra/Super-Wide (21:9/32:9) Specific Solution & Issues
Native Hor+ support.
(Negligible?) Credits are slightly cut-off.
Eyefinity / Surround Specific Solution & Issues
Native Hor+ support.
(Negligible?) Credits are cut-off. Loading screen on the other hand looks arguably better for the zoom-in.
4k UHD Specific Solution & Issues