On popular request we've added support for major 7th chords. 

Band In A Hand has supported dominant 7ths all along (they're just called Maj7). With version 1.2 you may also play major 7ths proper by choosing Maj7#. We decided to implement 7# rather than just major 7ths as it allows more flexibility and more choice (you may use e.g. min7#, 7#sus2, 7#sus4, etc).