As you know, some plugins like drum sampler/rack do not require a wide range of piano roll keys or even octaves.
Some require less than one octave, while Ardor cannot display this mode
Wouldn’t it be better to add an option to display the desired number of keys to the Ardor piano roll?
in bellow 5 key displayed
With this feature ardour do not need a channel rack or sequencer
you can like ableton impulse arrange drum note in one midi track
Note that the desired range of keys must be locked
And do not add to the number of keys shown by dragging track
This is a just a idea/suggest for the ardour team / no more