I'm pretty sure that Kjaerhus was NOT involved with Cakewalk's development of staff view.
The person/people that developed Cakewalk's staff view were spun off into a company called Geniesoft, where they created products named Overture and Score Writer. They are still very much in business today, but a few years back the company was renamed Sonic Scores. You can check them out at sonicscores.com.
I don't have their latest version (5), but I do have version 4 of Score Writer, and the dialog boxes for managing midi and audio devices are identical to those used in Sonar!