if something were to be added for free voice mapping ala polyES, it would be more consistent to apply it to each app, not just earthsea.
i’ve heard complaints that polyES voice assignment is too complex, which is fine for polyES - if you’re willing to learn it you’ll have the ultimate flexibility and some really neat tricks that come with it, and since polyES is a standalone alt firmware you know what you’re getting (although you don’t ever have to touch voice/output assignment for basic use). but adding it to ansible would likely create confusion for more users.
i would just see the leader modes as a simple way to send notes over i2c (and, used with MIDI app, a way to sequence TXo or JF with MIDI).