Snap to Grid or Rulers/Guidelines
One great feature would be the ability to set a "snap to grid" size for floating objects like text. Esp when you are making a sheet with a lot of repeated fingerings, etc. Then lining them up nicely would be easy. Another way to do it would be to have rulers on the top and side that you could drag guidelines out from (like Gimp or Inkscape) that free floating objects could snap to.