These are videos that are also scheduled for production, but since they are more complicated, then I've decided to create videos for most common operations first.
No way to add module via project.sh script to existing svn project. For now you need to create that project with in-commerce from start.
I had to choose between: produce a video on how to use script or enhance project.sh script with new functionality.
Any way you can ask me and I'll ad In-Commerce (or any other module) to existing project by hand. Since you mentioned (for some time ago), that most of the projects doesn't have In-Commerce, then it won't be a problem.