I came across this great presentation from Nicholas and saw this exciting feature that may help solve the membership setting I'd like to use:
He mentions being able to auto-create users with their own email addresses but its tied to a subscription. Does that mean if the subscription expires so does access to the additional users. And how would the username and password work?
In my case I would like the ability to sell family plans (subscriptions) with more than one family members having web access.