Doesn't RB have the hybrid MIDI Piano Roll/Notation editor mode? I always found this to be the easiest note-based editor around when I was using PowerTracks Pro Audio.

You have to choose this mode, it's not the default midi editor. I'm referring to the mode where the note value is presented on staff, the length is presented as a horizontal flag and the velocity is presented as a vertical flag.

That was and still is in my opinion, one of the most 'musical' way to do note-based MIDI editing.

Mixcraft DAW will display note length in it's notation display, as a horizontal flag, but I'm not sure you can grab the flag and change length right on the staff like you can with PTPA (and I assume RB).