How to Change Lesson Type and Scrollable Syllabus

Hello, How do I change the lesson type? see screencast - http://somup.com/cYjlrt6z6R When creating a new lesson the options are: video, audio, text, multimedia etc If a lesson is already selected as Text How can I change it to video etc? Can you make the curriculum list scrollable on the left while the content stays constant on the right? It is very hard to scroll all the way down to select a unit and then have to scroll up to view the content especially when you have a large curriculum with multiple units Being able to scroll would really help or when the student clicks a unit it jumps to where the content starts. Sometimes students select lessons and don't see anything and think it's not working Thank you KB