I've been finding that I like to have aliases point to multiple people. But, since that doesn't work, I have to use distribution lists. But, because I use distribution lists, the users cannot become that alias, unless I enable the "Allow sending email from any address" option.
It would be nice if the Distribution Lists had check box that would allow people to have a person pointing to that distribution list. Alternatively, you could also have a list of users that are allowed to have a persona for that distribution list.
Example of when this could be used. Say you have email@example.com, and there are multiple people that are in the helpdesk. Well, they can't become "firstname.lastname@example.org" unless they are given the permission "Allow sending email from any address".