Bomber helms have a visor too, which seems to be stuck at mostly-open. You can only see their eyes when they are charging a bomb or carrying a vial. It would be nice to have the visor all the way up or down, optionally.
Very much a cosmetic thing though, someday I'm sure they'll add all sorts of cosmetic options like this to make our personas more unique.
I like the idea quite alot actually, but it seems like such a mundane and trivial thing to add that I seriously believe that Three Rings probably would not put in the time to develop something like this.