Possibly not relevant: different aeroplane and FMS, but our Jepp database has coded 3° CDAs for approaches that have the RW waypoint and others that do not have the RW waypoint. My understanding is that the RW waypoint is used if the final approach track lies within 0.14nm of the threshold (or something like that).
Some of these approaches have the "3°" displayed amoungst the approach waypoints; others don't. Dunno why, but they all give a 3° CDA for the FMS to follow.