In my opinion, the question forum currently has an issue that impedes the forum experience;
A lot of questions are answered correctly but are not marked as accepted answer. It might be a nice touch to add a functionality to 'suggest' the correct answer either by adding a new functionality or suggesting the highest voted answer to the question's author as candidate when there was no changes in the thread for a certain amount of time. Could be an opt-off email notification or an indicator in a 'My Questions' section.