I would like to see the use of marker tracks incorporated. That would make this app the ideal for exporting stems from Cubase and playing along with your backing tracks in a live situation. The markers would give you the ability to quickly repeat or jump to any section of the song during live performances. The next step after that would be to add a set list screen allowing you to move quickly between songs. For me, that would complete the cycle.
Cubasis – Song idea
Cubase/Nuendo – Fully produced song
Cubasis – Live Performance