I found the XML file where the defaults are held and changed the default to Object Mode. Rebooted, opened Rhino, checked 3DConnexion settings: now defaulting to Object Mode. Yippee! Went to use Spacemouse and all movements are reversed. Closed Rhino, set default back to Target Camera. Rebooted, restarted Rhino, checked default back to Target Camera, Yes. Back to Spacemouse: movements still reversed. Change 3DConnexions app setting to Object Mode. Movement back to normal and continues running in Object Mode after Rhino restart, but settings back to showing Target Camera.
I think that’s the only sane conclusion: it is confusing.