Make it possible to extend ClassDataSourceAttribute and/or reuse functionality from ClassDataSources

[TheRumle]

I am trying to create a thin wrapper layer around ClassDataSources so I can abstract away a lot of setup details. I find myself needing the exact control mechanisms provided by ClassDataSourceAttribute, with SharedType and Key.

Is there a good way to mimic the behaviour of ClassDataSourceAttribute when ClassDataSources is internal?