On Post, Reply and Edit, a button to abandon the post/reply/edit without making changes
-- I managed to delete a post when I wanted to abandon the edits I was making
on the 'All Threads by Date' view, an indication of the forum for each thread displayed
Also, does someone editing a post cause it to be marked as unread to people who've already read it? I think it should, but then it would be a good idea to add a line at the bottom of the edited post to note it as edited.