As of current version of Far cry 4, can you alter the viewmodel fov?
Please do not mistake viewmodel fov for fov as whole.
vmfov changes the distance of the camera from the model of the characer in 1st person, so in other words, it determines how much of the weapon you are holding you see.
Now, when the first game was officially released, vmfov scaled with the fov, which means that if you changed the fov, you did not only had increased field of view in degrees, but you have also seen more of the character´s hands and weapon.