OK I will start by saying its a lot of work figuring out the guide tones for each song but when I play through changes the chord chart does not provide a lot of guidance for improvising. There's just too much information flying by. If I had a magic wand I would love to see just the 3rd and 7ths which may help to inform the direction of solos.

Another more user labor intensive approach could be if there were a way to notate the guide tones in the chart and then have that notation displayed in a new option in the chord diagram dialog box choices.

One can always dream