As previously mentioned.
Face customisation has been characteristic of warband/NW multiplayer. And a nice one too.
It is not just the matter with well known players. Regiment or other group members will eventually learn to identify
each other from a distance just by looking at ones face. Personally, when I was -very actively- leading/training
the guys of the 16th, I could recognise three fourths of them by their in-game characters face.
So, yeah, if it doesn't take too many resources. Go for it