How about adding a delete button? Some time (twice overall) I had to "report" my topic to moderation for request, so they could delete it. Because I had already found answer in some way.
The "unlimited" edit button. It does vanish after some time. I mean, few first minutes, it's there, but let's say over about 3 hours, it doesn't appears anymore. Could you just let "edit" button be there forever?