Feature idea - Allow for classes to be related to other classes so that renaming one class cascades to related classes

It would be great if there was a Visual Studio plugin that would somehow allow classes to be related to each other: for example Customer should be related to CustomerTests (its test fixture), CustomerDbMap (its Fluent NHibernate mapping) etc. That way if I rename Customerclass, say to "Client", then all of the associated classes are also renamed. The same feature would also be useful for keeping corresponding namespaces aligned across projects.