I sadly didn't have time to touch any programming during my three weeks of vacation. So I'm catching up. I just completed the "Grouping" and "RemoveNode" functionality of the Knowledge Review 7 "DAG Program".
Here's a little preview of what it looks like. All the "Node" behavior is hard coded, but the engine is coming along great. User Input is probably coming very soon. I got a few things to-do first.