OK, thanks for letting me know. Others have said the same. I am looking into it.
For now, you can copy/paste (as you say) and you can drag original drawings around to adjust timing (you need to be in Slide Mode). But this is only sliding them through your clones – you can not swap their places (as you know). This is on purpose. But I see your need for this. So we will probably do a third mode or something. We’ll see. Thanks again.