Simon,
an "interesting use case" means that we need a project we get paid for. Joerg and me are software developers working for a consulting company, and our daily job is to develop projects for customers. This is a full-time job or more which does not allow too much time to spent for projects we cannot use ourselves. At this time, we are involved into projects that are not related to development of graphical editors.
However, you can book us to work on your project and we would happily drive the project. But please understand that spare tome is completely up to us how we spend it.
Joerg, myself and the others would really like to continue the project.