I have seen a few people looking to do this so I have placed my idea of this very same thing on the back burner. I will share some of my thoughts on this though. If the facial hair has a few possibilities and a great texture map it will sell well. Now make it a character rather then a prop so it it conformed rather then parented and you will get some additional functionality. Essentially use the tailor to transfer some or all of the mike face morphs over to the beard and you will have a fully posable beard prop that will always fit the character and move as the character smiles or talks. I'm sharing these ideas with everyone I see getting this idea to hopefully have all or most of them implemented in someones product. I doubt I will be doing mine in the near future simply because of the people I see attempting it are much better at doing hair then I am.