Altered unisons style

Hey there!
Could there be another setting in the Notation Options to get this kind of altered unison line above it—as seen in “3 Keyboard Karikatures” by Abram Chasins: (last measure of the 1st page)—?

Altered unison.png

How widely used is this notation? Unfortunately it’s not practical for us to support every individual, idiosyncratic notation that might be used in a tiny number of editions. In this specific case, we might be able to handle it when we can draw a similar kind of bracket over altered unisons for whole notes or double whole notes, but that is not yet implemented in any case.