I think it would be handy to be able to have private page hierarchies collapse in the left-hand navigation pane. Our troop is currently using private pages to publish our troop committee meeting minutes online. Each meeting’s minutes are a separate page under a “Committee Meeting Minutes” page. Sooner or later that pane is going to be a long list of a bunch of individual meeting minutes pages. It would be keen if that nav pane would “collapse” the sub-pages of a hierarchy by default. Maybe individual users could also toggle default collapse on or off as a personal preference. I can mock an image up if the suggestion isn’t clear.