This feature was in beta 24.7 (IIRC), and I loved it! I planned a couple of projects, and then it disappeared. I've reverted to 24.7, but it's not there anymore. In fact, none of the Early Access items from then are present.
So, please put this back. It's fascinating and powerful and I need it. And now Deke is demoing it and nobody can find it. Yes, it's a beta. And yes, let us use it and submit bugs and improvements!
Thanks.