I think you could really expand the use of the guitar fretboard screen if you would allow the user to set the mode displayed on the fretboard. You could then see how the modes are used in playing. As far as I can tell you do allow either aoelian or phyrgian modes to be selected. By allowing others to be selected you could used those to help write music for those of us not fully trained. They could also be used for practice and learning modes, scales etc.