Thanks - I hadn't thought of that - and it certainly allows me to get a "1st edition" of my help pages done and to keep moving forward.
The one slight inflexibility is that I still cannot have individual pages that are exclusive to a particular Group since they will show up in the Structure. In other words I always have to have some content in every page that is 'useful' for the 'lowest' access Group.
I'd be really interested if there are any other thoughts on this and whether anyone else thinks the suggested functionality is worth adding to the Wish List.
Thanks again for the help