We have a complex wpf-program to test. To do so we have been created several repositories. It would be very helpfull to link a root folder from one to another repository.
E.g. you have a repository "adress" and one called "article". Selecting within arctivel the delivery-adress the adress-dialog will opend within a modal dialog.
But you can also open the same wpf-view from the ribbon menu.
Using RootFolder-links you would be able to link all controls downwards the view.
Specialy in xaml it would be helpfull (look at the custom controls e.g.)