yummay
I feel the "pain" about the staff view (as much as my limited knowledge of musical theory allows me to anyway...) but, if I remember correctly, Cake once had a specific product for notation. They sold it and... it became NOTION (which is now owned by Presonus... funny...)!
Bottom line for me: that deal must have had some kind of clause preventing Cake to develop their notation for "X" number of years...
I'm not sure about the Overture => Notion connection (from Wikipedia):
"Overture was originally published by Opcode Systems. It was later published by Cakewalk Inc. It is, as of 2009, published by Sonic Scores (previously named Geniesoft), in both boxed and downloadable versions. A less-expensive, scaled-down version of Overture, called Score Writer, is also published. Demonstration versions of both Overture and Score Writer are available at the Sonic Scores website.:
There may be a non-compete clause with Sonic Scores, but probably not with Notion (now Presonus).
Besides, no one is asking Cakewalk, Tascam, or Gibson to develop a full blown notation application.
Perhaps Gibson could license Sonic Scores Overature or Finale and shoe-horn some new staff editing into Sonar X.