add a "Velocity" Propierty to the Chord object.
Every possible plug in I can think of lately needs the possibility read and write the velocity of chords.
It would allow for note to note cresc. decresc. Plugins and chord accents, and If a visible note could be muted, and a different invisible voice could be played, then the possibilities are much more: Glissandos (cromatic, diatonic or micro-tonal), de/Crescendos (on 1 note), Harmonics, and all kind of articulations and ornaments.
(I think finale used to do this things exacly like that. When a trill was added and the "play ornaments" or something like that was pressed, an "invisible" new voice was actually written on the score with the notes of the trill.)
Thanks for all!