I would like there to be three buttons: "< Back", "Structure" and "Forward >"
New "< Back" returns to the previous material (if it is in the folder)
The "Structure" works just like the "<< Back" now works
"Forward >" allows you to read the following material in a folder.
Moreover, consider that scorm learning objects haven't the back button as they open in a modal.
If you have clear ideas about the whole flow, you may send me a private message for a quotation.