I would be surprised if this isn’t in someone’s wishlist at Fatshark’s office, but nonetheless:
I think it would be quite nice to have a “Bio” page (or call it whatever) for each of our characters. It’s all nice and good to be able to choose your origins and life defining moments when you create a reject, but quite frankly, I have forgotten most of them, so it would be good to have a place to go back and check (and maybe even change?).
The other kind of stuff that could be there are statistics. Things like how many missions of each type you have played, how many enemies you killed, with what weapons, etc. You can get some of this information from the penances menu, but it’s not really what it’s made for.