The Navigation Bar is a great tool, especially for larger StoryMaps that cover a number of discrete topics.
I sometimes find myself wanting more granularity in the ability to navigate to particular sections, however. This would be particularly useful for some of the more technical StoryMaps that I've published, which are designed as reference guides.
It would be great if there was the option to include secondary headers as drop-down components of the main headers in the navigation bar. This would make it easier for users to skip directly to the precise section that they want to access without making the Navigation bar longer than is reasonable.