[curt.clifton]

That's a popular and much debated request. OF seems to work better when you have lots of projects that are fairly shallow in the hierarchy. Nevertheless, I also use action groups like you suggest. By design, the action group parent never shows up in the context view. But an action group whose children are all completed will not block subsequent actions. I have a script that will check for action groups and projects where all the children are completed. It tags these as missing their next action. Then you can search for the "Missing NA" string and decide whether you need to add an action or can complete the project or action group. I do that as part of my daily review, though weekly might suffice depending on the general urgency of your tasks.

The Verify Next Actions Exist script is available from my software page.