Here's an alternative to Staff view improvements (that seems to be taking forever to fix): integration in Sonar of either Finale or Sibelius - I know I tried Sibelius a while back but could not get it for the life of me to work properly in Sonar.
I'm not a programer but basically it would be great if you could write in Finale/Sibelius and those midi tracks could be routed to a sampler/synth etc... Being a classically trained musician I find it much more useful to follow harmonies and counterpoint in notation rather than dots and lines of PRV. The PRV does have its place but sometimes I feel like I'm writing Morse code rather than music...
This would leave notation programming to the ones that have a lot of experience with it. Maybe it could be a win/win for both Sonar and Finale... Just a thought...