Given that you're limited to a maximum of 10 users, I don't think you'll want to create a user for every aunt, uncle, grandma, grandpa, etc. Probably a single "family and friends" user with read access to those shares that you want them to be able to access
would be a better plan.
That said, you might want to submit your product suggestion on
Connect.
I'm not on the WHS team, I just post a lot. :)