Minor RestChord Problem with ver 1z
You cannot remove an articulation from a RestChord
You cannot add an articulation to a RestChord
In order to have an articulation on a RestChord, you must have the appropriate button(s) down when you add the note. I can see no technical reason for this and it is not user friendly.
Frankly, I see no necessary distinction between a rest and a note with a special notehead that, when encountered, does not play.