Looking at the compose window, I feel there is scope to simplify it by removing some infrequently applied elements. Who creates h1, h2 h3, h4 and h5 headings in forum posts. In the order of frequent use, it is link, quote, bold, italics, picture, and attachment buttons that are frequently used. Other buttons could be hidden or even removed without creating friction.

It looks really pleasing. I especially like that it doesn't give too much space to display avatar and user information such as join date, user category, posts and so on like many traditional forums that always used more vertical space than many one or two sentence replies, eating up vertical space.