How can I control available document types that can be created in a workspace using Studio?
I defined a document type extending workspace that limits what documents can be created within it.
How can I add a BIRT report to my limited list of documents that can be created within my workspace using Studio?
Reports are not on the Studio “accepted children type” list.
You can follow this documentation to declare missing document types using registries.
Document types coming from Nuxeo addons are not are made available by default in Studio, and this is a way for you to add your own too, if you have others that you'd like to appear as resources in your Studio project.