Baseline (Widescreen) Solution & Issues
The max Resolution is 1440 x 900 - everything above need to be Hexedit.
The Original Steam EXE is Protected so you need to go to Gamecopyworld and get the EXE from there --> gns-toy3.7z
Open the new Game-TS3.exe in the Hexeditor, look for 80 02 00 00 E0 01 (640x480) and replace all Parts to 00 0A 00 00 A0 05 (2560x1440) or your preferred Resolution, then download the Flawless Widescreen script and run Flawless Widescreen with it enabled when the game is running to correct the display behavior to be Vert+ below 16:9.
Optional FOV: To adjust FOV, adjust the slider using the said script when running the game with Flawless Widescreen or press the keys set via settings.
Ultra/Super-Wide (21:9/32:9) Specific Solution & Issues
Solution same as above.
Issues: See menu Screenshots
Eyefinity / Surround Specific Solution & Issues
Solution same as above.
Issues: See menu Screenshots
4k UHD Specific Solution & Issues