We just finalized an article explaining how users can write their own views on a process model using the extension points of the JWT Workflow Editor. Thereby, we describe the aspect-oriented mechanism which is part of JWT to extend the existing metamodel by external plugins. But not only the extension of the metamodel is important: also the customizing of the tooling (palette, figures, editparts, etc.) from the outside is covered.
Hopefully, the article will be accepted at the German speaking Eclipse magazine. But if you (and we) are lucky, then the talks about views and aspect-oriented modeling will get accepted at Eclipse Summit Europe. So maybe we'll meet in Ludwigsburg and we might have the chance to show you how to create your own view and use the extension points and components of our project.