"Certain events will reset the FOV"
Fragment of a discussion from Talk:BioShock
Depends on what can you find in config files, I don't have it installed so I cant tell you precisely. But this is early Unreal 3 engine game so check similar games for guides like Mass Effect (series) or Dishonored. These contains binding guides that can help you.
And if you figure something out don't hesitate to add you finding to Bioshock page!
