Making hair and beard models is a huge amount of work, but looking at all the hair mods we already have, I'll second this. I'd really like to see a beard that kind of meets the rough beard and survivalist halfway. A goatee based on the rough beard would also be cool.
Oh I know, I'm certainly not trying to downplay how difficult it must be. I've done a fair amount of modding myself, and I could never get a proper handle on 3D modeling.
But that's my line of thinking exactly. We have a ton of hair mods already which are all very nice. But beards are being sadly neglected. I mean, there are a ton of default options to choose from already, but it's disappointing that we're stuck with only two full beards.