We had no choice but to introduce this change a couple of years ago. Some members decided to delete all their posts, and this became a nightmare as quoted posts with the deleted posts remained and the rest of the discussion on the thread had no flow, or was difficult to follow.
Nick has found that we can extend the time from 5 minutes to 60 minutes. We are looking at that change now.
Regarding spellchecking, the browser (IE, Firefox or Chrome) can be configured with a spellchecker.
