[curt.clifton]

I'm not sure that I'm parsing that string of "nots" correctly. Are you saying that you want to be able to few all your actions other than Waiting For actions? But then you also want to be able to view your Waiting For actions separately?

If that's the case, then WF should be a plain old context. You use selections in the sidebar to control which contexts are displayed. Select All, then cmd-click Waiting For and you get all but the WF actions. You can save that as a perspective to easily return to it.