i played the whole game in immersive screen mode in Z3D without this first person mod which is not playable.
you can tweak ini to get a custom FoV, i had something set like 120.
it was totally amazing !! best batman experience ever.
here’s a guide to know how to set your own FoV
https://steamcommunity.com/sharedfiles/filedetails/?id=548296547
btw i played the whole game with keyboard + mouse because gamepad conflicts somehow with headtracking, it was neat anyway. and i used f11/f12 to swicht FoV on the fly.