At this moment this is not supported, namespaces are not core attributes and cannot be used for element identification in the Skipper visual model (only the element names are). The change required for the identification of entities by names and namespaces will require complete rewrite of the application logic. Because of this, implementation is not on our short term plan.
Alex, can you please provide me more detailed example of your intended use? Perhaps we can put together some workaround, but at the moment renaming the entities seems to be the easiest and most straightforward solution.