The editor is good, but I'd like the ability to add a drop-down to the toolbar that contains predefined styles that I could apply to elements being edited. These styles would simply be classes, not inline CSS. For example, I might have a style named "Introduction" that applied the class of "intro" to the element I have selected.
Implemented in the Q2 2013 release!
Sorry, one detail. If you have defined element in user.css (eg h2.big) and you will use it eg for paragraph, editor will change it to h2.
I think good way is like TinyMCE here http://www.tinymce.com/tryit/custom_formats.php The combo box Style directly parse user.css file - you can define classes with or withou element (h2.big or .big), combo shows class name and you can use it generally or only for defined element.