PC gamers like myself enjoy nothing more than digging into the data of a game, only to emerge again with improvements that can be made to games like Metal Gear Solid. One such group of nosey gamers went routing around inside the Ground Zeroes code and found that it was possible to expand the games field of view to a scale that suits you personally.
On top of that, they found a way to unlock the games frame rate in its entirety. Whilst the PC port of Ground Zeroes was stunning, the omission of an unlockable frame rate was a bit of a glaring issue that cause some fans a little bit of grief, though nothing that harmed the gameplay experience.
You can find everything you need to know, and more in the ever reliable Steam Community pages which you can visit here without needing to make an account. Though the chances are good you already have one.