The next thing I would like to implement, and thanks to Antonio who gave me the idea, is to be able to install Swarm Fractions automatically when a Facet / Addon is installed (and that the project has off course already the Swarm Facet), so for instance, if I do a "jpa-setup" it will also install the "jpa" swarm fraction.
The central piece of that, is having a document / table ,whatever, that describes the best the mapping between these 2 things. Maybe basing it on a facet installation event is not enough, maybe there are other forge command that should also trigger the addition of a fraction ...