Nested Sub-page Navigation

I added this as a feature request but on the off-chance someone on staff can tell me how to do it myself I am putting the request here too:

Simple request: I love the option for sidebar navigation (for nested subpages) but in a site with lot’s of pages (and nested pages) that link across one another, it can get confusing. To aid the user in navigation please can you add the name of the parent page as a header to the nested subpage navigation?