If you don't know what I'm talking about, here is a picture.
Another thing that I think could be improved, is to mark forum sections as "Read." For an example of what I am talking about here can be found at http://www.revkites.com/forum. The forum sections that appear blue are clickable, and after you click on it the icon becomes a lighter blue, and all threads in that section are marked as if you have read them.
Just while posting this thread, I actually found two more areas of improvement.
1. Hyperlinks. There is no simple way to hyperlink a phrase/word to make it clickable as a URL.
2. Now image uploader. I believe a while ago there was the option to upload a photo to the forum. In order to post a picture, one has to upload it elsewhere, then insert the image to the post.
The forum I mentioned earlier (http://www.revkites.com/forum) is a good example of how a forum should run.