Downloading the game right now, purchased on Steam. Havent tried it yet, but since it's Unreal Engine this might work.
In the following line, XXX represents your desired FOV.
try adding the line
Code:
Bindings=(Name="W",Command="MoveForward | FOV XXX",Control=False,Shift=False,Alt=False,LeftTrigge r=False,RightTrigger=False,bIgnoreCtrl=False,bIgno reShift=False,bIgnoreAlt=False)
in place of whatever existing
Command="MoveForward" line appears toward the bottom of the file. Before doint his, you may have to go to the in-game controls menu and re-bind the forward command to show up in the INI file. As soon as you rebind, the new line should appear. You can set it back to W (or whatever move forward key you prefer) in the INI file, the point is to rebind temporarily so that a custom MoveForward line is written.
Setting the INI file to Read Only might be necessary.
Let me know if it works? I have noticed that sometimes the re-bound keys will not take unless you edit the original line and the custom line -- Multiple binds may appear under Engine:Playerinput and Engine.DebugCameraInput, and possibly elsewhere. Basically if you search for all instances of
MoveForward or
Name="W" and edit accordingly, there's a good chance you will get it working.