Currently, the guitar fretboard displays Aeolian and Phrygian positions for scales (the G and C positions, respectively, in the 'CAGED' scale system. It would be nice if the user had the option to choose other scale positions, for a total of maybe 5:

C Phrygian (starting on 3)
A Mixolydian (starting on 5)
G Aeolian (starting on 6)
E Locrian (starting on 7)
D Dorian (starting on 2)

This idea has been discussed at length in this thread:
http://www.pgmusic.com/forums/showflat.php?Cat=0&Number=342641&an=0&page=0#Post342641

Thanks!
TheSleeve