I would love for a poster (and maybe admin as well) to have a "Resolved" status.
And maybe more statuses as well like "Question/Poll" - as would be great to filter by resolved or questions, etc. Or if the attachment has a file or video attached to it.
The great thing about a resolved status (and I prefer that comments are left on when a status is resolved so someone can add something extra).
Is that you can search for problems that have been solved.