As you know we use a lot of post notices on this site. I think they are very useful and work very well, but only moderators can add and remove them.
I see no reason why that should be the case.
I propose that 15k users (in other words, users that can protect questions) should be able to add and remove post notices.
Does the community agree? Should there be a vote of 3 users? No vote?
Should there be a mechanism similar to question protection where only the user who adds a notice can remove it?