Seconding the calls for p-locking the arp.
Even just being able to p-lock the arp on/off state would be amazing (… as long as the arp settings for the sound stayed intact when turning it off).
Feature request: arp on-off p-lockable.
This could cover the roll/retrig use case. And also it’s just a lot of fun.
I’ve been using a quick arp on a short trig with chords to play harp/guitar-like broken chords for a strummed/plucked effect, and to be able to opt in/out of that per step would be glorious.