Scafolding can be acheived through discussions, through the knowledge brought forth by each contributing student. Students can build on knowledge acquired from others. Having a dynamic syllabus allow it to be shared where studnets can access and utilize at any time. Yet I am unsure why a dynamic syllabus is beneficial, except as gingerbread for easily distracted students.
I am not planning on using dynamic syllabi. This is, among other things, a contract - by nature a static document.