While I agree that you may feel it's is best for the average person, and that it's how you want the game to feel by default, you should still give the user the option to change it. Customization of everything is key on PC. Just put an advanced section, a little warning that changing options there may have unintended side-effects or that it may not give the optimal presentation, and be done with it.
In other news,
https://www.widescreenfixer.org/test.php
I added support for this game.
It lets you change the aspect-ratio, the field-of-view, and it fixes the interface being cut off for Eyefinity/Surround users.
Before:
After:
