Is flap 5 just leading edge, or is there some trailing as well? Presumably you'd be getting some area increase at the trailing edge with one of the early settings.
The 380 also had an automatic setting. Flap 1 was actually just slats, but "1+F" was flaps and area increase at the rear. If we selected F1 on the ground, we'd actually get "1+F". After takeoff, it would automatically retract to "1" about 15 knots before retraction speed. And when on approach, it would also stage through 1 to 1+F by itself. All to do with the speed limits for the various settings.