When two natural harmonic notes are in an interval of a second, it would be nice if the harmonic circles were arranged horizontally, centered on the noteheads, rather than stacked vertically. (I’m thinking mainly of the harp here.) For two natural harmonic notes in an interval of more than a second, vertical stacking is fine.
We would need to implement some general improvements to placement of playing techniques to make this happen. I agree it would be a good thing for us to add.