I think the current races could really use some more features and that would be a good middle ground and compromise for people wanting more character customization options. I get that having sliders or body drastic changes is not possible, but they wouldn't need to change a whole lot of features nor animations or textures. Just create a new base for faces like they do with specific npcs. Perhaps a new eye or mouth shape if these aren't too hard...

I believe that at least two more face options for each race would make a huge difference and bring more diversity to the game, much like adding new hairstyles do. Of course, a hairstyle is much easier than a face for each race (one for each clan), but still, it's not a sophisticated and impossible request, at least imo.