The FreeFOV mutator by Miles Asvachin has been added to the server commandline.  From the readme:

“With it running, open the console (press TAB for the quick console or F10 for the full console by default) and type mutate fov 90 (or whatever your desired FOV is in place of the 90) and press return. The value you last set will be saved in the INI file so that it can be appplied next time you run the mutator. The FOV value is a client-side setting, so if you join a server running this mutator, you will get your own chosen FOV. The allowed values for FOV are 70-130o. Values above 130 are disallowed because the camera starts to clip, allowing players to see through walls.”

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