Hi John,
Yes, you can identify a connector as refined. You use the method getConnectorRefinement() which will return 'null' if the connector is NOT refined. Otherwise it returns an object (IXConnectorRefinement) containing all the refined connectors and signal mapping.
Note that you may need to be a little careful when assigning preferred signals to refined connectors. I believe the preferred signal attribute needs to be added to the cavity on the 'parent' connector rather than the 'refined' connector.
Regards,
Simon