Add default shortcuts for intervals below
I think Musescore is missing a very simple function on musescore that would make it easier to draw chords: adding notes/intervals below the reference note (a pre-written note). When I have a written Soprano, for example I can't add notes below that (as I can write 'above' them with the "alt + number" command). I think that this could be implemented on next release.
GIT commit: 3c7a69d