Slugbaby
 
This is pretty much what I do.
If you have both MIDI tracks highlighted in the PRV, you can see the "faded" keyswitches when you're working on the notes, or vice versa.  Or you can only highlight the notes and focus on them.
 
I've found it easiest to have them both on one MIDI track while I'm building the basic track, then clone it and delete the keyswitches from the "performance" track and the notes from the "keyswitch" track.  Then tweak them separately as needed.

I always learn something new from this forum!  Thanks Slugbaby for sharing your approach to entering keyswithces.  I normally do the same thing, enter keyswitch notes on the one track I am entering notes on.   Someday, I might need to prepare one of my Sonar compositions without the keyswitch notes on the staff to mess up the print out or export to Sibelius.  Cool!  Also, I like Sidroe's suggestion about using track folders. 

khapahk1956

MFanning
Not sure there is a way to do that, but one thing you can do is set up two tracks feeding into the one keyswitch instrument.  One track for note entry the other to enter the keyswitch notes.  An easy way to do that would be to clone the instrument track before starting so you have two tacks for the same instrument.   One track for note entry, the other for keyswitch notes.  -M.F.

I've just tried your suggestion and it gives me the result I'm after !  Combined with Sidroe's folder suggestion, this could be a way forward.
 
Bob

I'm glad we were able to help!
M.F.