You are right in that the flight director does not appear to show anything meaningful on final approach for this aircraft.  It works fine and indicates correctly when using heading mode while in flight.  But when selecting AUTO APP mode the flight director does not display as expected.  However the ILS works correctly.  I did not realize this earlier because the in the default view for this plane the flight director is not turned on.  It can be turned off and on with the Control-F key.  Thanks for pointing this out.