One of the most frustrating things about giving users support in forums is the inability to "clean" the forums by separating solved and unsolved messages. It would be nice if all devs could easily change the posts subject to solved, or flag the message solved in some way. As another feature request, to have a button that would toggle unsolved messages / all messages. I'm a not a dev (I'm in waiting period), but even if I don't become one it's something nice to have.
Forgot to add: [solved] is just an example. I would be great having the same flags as bugzilla for instance, with NEEDINFO,etc, maybe add OUTDATED.