Share proof with guests without a login

We desperately need a way for reviewers to share proofs with guest users without requiring a login. Many reviewers will only view one proof and never use the system again. It's counter productive to ask them to create an account just to comment on a proof. Perhaps only require their name and email address?

Often even if guest users have a Workfront login, it does not work for Proof HQ when a proof is shared from another reviewer.