The message editor is horrible. When editing a message all the paragraph spacing seems to disappear and when your post has images they are full size although the edit box itself is not so its a pain in the arse trying to edit a message. It needs a different editor or a larger edit screen with advanced options.

I´m agree with you, needs an editor with youtube, spoiler, code, php separated buttoms.

For me CKEditor is the choice

http://ckeditor.com/demo