Dear devs, in KDE 4 it was possible to add a spacer between buttons to group them visually. I just upgraded to KDE 5 on my laptop and missed this feature. Is there any change of getting it back? :) On a sidenote, moving items to and from the setup area and moving them around within it is very difficult, because there are no visual clues as to where items need to be dropped.
*** This bug has been marked as a duplicate of bug 348393 ***