it would be very helpfull if you could view more than one keyboard roll/track at a time:
example: being able to view the your bass track and your drum track at the same time. the reason that could be extremely usefull is you could copy paste note info without switching screens, and sometimes just seeing other tracks is a great reference for the current track you are working on.
another option would be the ability to have several sequencer windows open at once. just go to "new sequencer window", and it would come up as exact copy, any changes would correspond to all the other sequencer windows, but you could change the view and tile the sequencers how ever you like