[Craig]

I put this setting to use with my "waitingfor" context. It allows me to include those tasks in my project planning, but not have them show up when I list available tasks in context view (since they are not actions that I myself can take).

The only small annoyance is that revealing the waitingfors for review is a two-step process as you mentioned - context to waitingfor and filter to remaining.

(Perhaps "allows next actions" should really be "allows available actions"...)