I am always thinking it would be great if I could make a toolbar with, say, 3 or 4 buttons....and not lose use of the rest of the toolbar.
Perhaps, an option that allows use of total number of buttons in the toolbars, but allows then to be placed in smaller groups, of 4, 6, 8, 9, 10, etc. or, alternatively, the ability to "fragment" one or two bars to allow more customization of the UI for buffs or special abilities....