I received word that 3dConnexion is re-writing the licensing to be less restrictive.
But, blender development with libusb is proceeding more quickly and is likely to be the implementation of choice. I don't have detailed information about libusb for windows. It exists, but seems to require compiling with Borland C++ only (the free version?).
RBC9 worked as advertised, but the view controls inside blender don't include pan in x, y, and z, and the x, y pan is screen relative, not scene. That, and mapping to keystrokes allows only one axis delta at a time.
Update: libusb-win32 makefile references gcc, bcc, and msvc. Seems the Borland C++ reference is out of date.
SpaceNavigator vs Blender
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