I'd like to the ability to use the "drum notes" view in the Piano Roll without having to set up a drum map. Also the ability to edit the note names and save for future reference. See the way Reaper handles this as an example. I've always found the drum maps in Sonar clunky and way too complicated for my needs.
I see another exit is to add “Fold” button.
In Ableton Live we have a drum rack which adds sampler on some notes. So we have 36 with bass drum and 38 with a Snare. Then we’ve left 37 untouched with no sample on this pad.
After opening piano roll in Live we can press Fold and all pads with no samples are gone and we can only see pads and notes which we’ll be using.
Also, renaming notes in Reaper is very easy and fast. Would like to see the same things in Cakewalk.