I mainly use SCS for theater.
"Cancel Repeat" Cue is a great function that can be very useful when music starts during a scene and must end (without fading) at the end of the scene, or at a special moment.
As theater is a live show, and live actors are not "Timecoded" as they would be during the postproduction movie music work process, "Cancel Repeat" Cue allows you much more flexibility to adapt the music duration to adapt to a live action according to actors performance.