yea - I thought about the same limitations which might be hard to overcome.
It would be a cool feature though (even with the limits you have stated).
I’d love to be able to cut/paste different sections and snippets of arp goodness on a midi/note level rather than on an audio level.
oh hey… pLockable arp at least maybe =) ?
edit: oh and I would be curious to see how the workflow with your script(s) would look like. ta!