I am not sure if there has been any dialogue between the Eclipse EPF Composer team and this project, but the EPF Composer currently doesn't support collaborative work for adding to the method libraries. It desperately needs the functionality (due to the space they are working in) and that this project has the potential of making it possible.
I understand that UML diagrams and the like are not currently supported, but it would be great to see some communications between the two projects to improve this final product.
Perhaps Marc Goubert can make sure the teams are in contact with each other - if they aren't already.