On the discussion app, the section editor should be notified there are comments pending?
Have the discussion app email the section editor when there are comments made. Make this an option in the app options. Another option would be to set a notification flag on the app page on the frontend so the section editor knows to go in and approve the comments.
More specifically, I think it would be great to allow discussion participants to "subscribe" and be automatically alerted when new comments or questions have been posted. This would allow more brisk and timely discussions.