In 1.5.3  there’s an option available for navigation:

traverse-chapters

What this option does is allow the previous and next (in chapter) navigation buttons to not just “stop” at the beginning and/or end of a chapter.

When at the end of the current chapter and you click next, it will check to see if there’s a ‘next chapter’.   If next chapter exists, it will allow the next button to navigate to the first comic in the next chapter.

.. And same concept for the previous button, if you’re at the first comic in a chapter and you use the previous button it will navigate to the last comic in the previous chapter if there is one.