If I may,
Features available in current editor.
Topic name name instead of poster's name on drop down replies.
5.I guess that's all
I don't know what you mean by 1, and 2 is already implemented - you get a notification when someone upvotes your post.
I never got. As for 2, features like image/ url pop up windows, alignment etc are not available at the moment. Would be glad to have them.
Auto resize images. Helps a lot.
Full size preview. Is it possible to get a full size preview. The preview windows (and composer) are small. Can we have an option to enlarge them. Just like drag to expand kind of thing ?
There is a small handle at the top of the composer, you can drag from there to resize.
Well as @lukelarris stated 1 and 2 are already there. Sub-categories would be nice as well.
Buttons to add social profile pages on top.