In preference to updating the global chord library, I’d prefer being able to create private named custom chord symbol libraries. There are thousands of chord forms in common and less-common use — see Ted Greene’s Chord Chemistry. I might create a bluegrass library, a first position library, a dominant chord library, a lower four string library, a first inversion library, etc. It is important to distinguish the simple chord diagrams that go on pop lead sheets, which are basically hints for non-reading musicians, versus the more sophisticated diagrams used in educational material where voicing is crucial to an arrangement.