This is an interesting addition, but why just hair / color? No way to grow or trim a beard?
I know this sounds strange, but skin color, too - no, I don't want to make my whole vault white or anything like that. Just the opposite- the way genetics works in this game homogenizes everyone. I'd just like to be able to diversify it a little.
As long as you're giving us these options, why stop at keeping it so minimal?