Ability to Set Comment Visibility when Creating Comments via Email

It would be great to have a feature to set a comment's visibility/restriction when generating it from an email.

Couple of ideas that I can think about:

• Setting a specific keyword in the email (much like the delimeter option for the handler Add a comment before a specified marker or separator in the email body)
• An option when creating a handler; paired with a specific email address that users send emails to for comment creation.