Editing posts

There are some messageboards (such as BoysOnYourScreen) which permit one to edit posts up to three quarters of an hour (or something) after one has posted them. After the elapsed period one can no longer edit them. This grace period has the merit of enabling the poster to get rid of typos, which are invariably only noticed once a contribution has been initially posted. Would it be possible to introduce this relatively minor change to the BC forums, or is the current format necessarily set in stone as it is?