In the Ubuntu user board there’s a possibility to mark threads which discuss problems as “solved”. For this there appears a green hook before them in the overview. That would be a nice feature for this board, too. What do you think? (They use phpBB, too.)
Well, I asked this question in the Ubuntu community and unfortunately they said, that there is no phpBB mod for this. They coded it themselves and can’t extract the code. But it’s OK for them, if this feature is reengineered… What a pity