1.) Default (and only) FOV is 80, same as Fallout 4. Can't change it.
2.) Only 16:9 aspect ratio is supported. You can tweak it in the ini file, but the UI will go off screen and the ini file defaults to a known 16:9 resolution every time you launch the game again
3.) Various UI/HUD elements are linked to the default FOV setting just like Fallout 4 so UI elements stretch below the physical screen rendering the game unplayable. If we could change it, it would at least be playable at different aspect ratios. It'd look stretched and terrible and it's not an acceptable solution at all whatsoever but at least I'd be able to click out of menus.