Cool that we got it in 5.60.
It's only a bit odd that the actions have "notation view" in the name, but in the piano roll doesn't ignore the voice. Without the hint in the name this would be less surprising. IMHO it would be fine if they ignored voice/staff in pianor roll so you can use the same keyboard shortcut for note navigation in both modes.
Masi
PS: Another idea is to add a "MIDI notattion vew" section.