I'm not sure if this exists because i can't find it. A great time saver would be if you could choose an element and redefine this as the new 'class'
For example you've done some new text and in paragraph and prefer this style but have already got an 'all paragraph' style. It would be awesome if you could click the style in the selector and where it has, rename, duplicate and remove - add one saying redefine.
Hope that makes sense, if anyone knows how to do this or if its possible in future let me know.