Sorry, Nick, I posted (or started to reply to your post) before your edit. No way I could have known that at the time..... Don't get worked up for nothing.
The thread may bore you, but does the idea seem useful? I'm still waiting to see if I'm the only one that thinks this would be a neat (and fairly easy to implement) idea for some of the more complex arrangers.
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An arranger is just a tool. What matters is what you build with it..!