restricted navigation and button branching

There's a point in a rise build I'm developing where users select one of two buttons enabling them to continue or to skip a section. We need the restriction so that users can revisit, but not skip lessons, however with the navigation set to restricted, users who skip the section cannot progress. We can set the navigation to free and remove the sidebar as Alyssa suggested and will do that for now, but the downside is that users cannot see their progress or quickly revisit a lesson.

My feature wish: It would be great if there was an additional navigation mode (like Storyline's three modes). The current modes could be free and locked. A restricted mode could just stop users from progressing via the menu, but with no restriction in progressing by clicking the down arrow to go to the next lesson.