The ability to move chords in the Builder Section rapidly by shifting up and down a semitone and a full tone would be a nice addition to the Builder Section and allow you to experiment and change progressions rapidly. It might even to useful to be able to switch in and out of parallel harmony by quickly being able to make a minor chord major or visa versa.
The other useful thing might be to be able to Store a Chord that you like so that you might be able to bring it into a Progression in the Builder as and when you want to. Then to be able to select the root of that chord as well would also be useful.
Lastly I think it would be great if the Song and USER section ( Section A) was released from the Scale Element. So have the Scale element separate to that section so that when you want to look for a Scale the Song/Artist and User section does not disappear entirely. Saves having to recall it all the timeā¦