Would it be possible to add access to the shading control set points in OpenStudio?

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Access to this field is planned for inclusion when the daylighting objects are added to the OpenStudio Application. It is problematic to support this field in the SketchUp Inspector because the SketchUp Inspector does not have access to the logic in the OpenStudio Model.

For this and your other questions (if they don't turn out to have an answer) you can add an OpenStudio feature request on the OpenStudio forums.