Does the CustomsForge Song Manager include a Packer/Unpacker like the Rocksmith Custom Tool Kit? If not, I think that would be a very useful feature since it's pretty much the only thing I need to manage in my DLC. (But I understand everyone has different use cases).

I don't think that we've implemented that as a separate feature ( there's an option to edit songs directly, which extracts them in your Temp folder and then repacks them from the same folders, but it doesn't let the user directly change the files, unless they find them manually )