Adding Dynamic Next Lesson Button on Thank you pages

Hello! We like the dynamic Go to Next Lesson button that is added at the bottom of the quiz feedback page in v 1.18 that displays at the end of Quiz or Mixed lessons. We notice that this button is not part of the "Thank you for completing the lesson" feedback that displays at the end of the Theory lessons. Since we mix different types of lessons in a course for students, we would like consistent navigation to the next lesson. When we looked at the code in the template.php, we see the code but we can't get it to include the dynamic code. We have tried overwriting with ! but no result. Do you have tips? Also, we would suggest this an permanent enhancement to add this to all feedback pages that appear at the end of a lesson where a next lesson is part of a course. Thanks! Marcia