With the exception of the non-theory based easy (1 finger play) mode, the fifth is already generated when you press the tonic. My point was to endorse the second key pressed. I think it makes more musical sense to use the correct 3rd, or 7th to generate chords, and if a more complex chord is needed, than more fingers do the job. Rikki makes a good point that many theory-limited users just want a quick Magnus Chord organ approach, and that's great. I am a limited player - my left hand has never played complex chords, because it's always been a bass player. Even on an acoustic piano - my left hand is playing root-5th-octave most of the time to fatten up my chord choices.