Okay ...question. What's the difference between 'approve' and 'do nothing?' Presumably both allow the thread to continue?
No, not really. All of the threads that go to the Queue default to the do nothing when you enter the Queue as you see in the image. If you click it, it does exactly what it says, nothing. If you instead hit approve, then the thread goes live into the forum and can be seen by the forum members. Prior to any of this, the threads in the Queue are invisible to the members.
Ah. Mercy buckup. I understand now. That 'do nothing' is more or less designed to give the mods time to think about a thread and/or confer about it? Good idea.