There is a command for change the FOV.
I don't remember it, but I'm sure that it is easy to find it.
Try something like that :
And something like FOV
Some times ago, there was a menu for change it. But it have been removed because a patently change the FOV was cheat :D
(with a big FOV you canssee more)
For the graphics settings, there is a problem : we can't do real settings : the maps use different textures, bad textures, good textures, 3d textures act..
then we can't really make real settings for this.
For the "shadows" maybe it is easy. I don't have the UI code under my eyes ( I'm in my bed with my phone) but, I'm sure it is changeable. Maybe it is juste a value XD
All this for say you : there is a command for change the FOV (toworrow if I remember this I will post it) and there where a menu for that.
For the graphics, don't wait something incredible.
for example : on my computer I have the graphics on ultra : the textures are bad in practically all the maps.
We can put all the settings we want, the maps have to follow.
I can add the shadow setting on my to-do list.