Hi there, @davidcmc, thanks for taking the time to post to the Dropbox Community.
What you described in your post is not currently possible with Dropbox Passwords.
However, I would suggest posting your idea on our idea board, for other users to up-vote.
Our team takes ideas that get enough votes into consideration for future updates.
Just make sure to check Emma's tips for submitting an idea, before you do so.
Let me know if you have any questions!