Pretty much every feature in this Max Device should be available natively in the Piano Roll editor. Simple context menu options, or perhaps another tab in the editor?
https://maxforlive.com/library/device/5 ... ion-filter
Pitch — select all notes within a range of pitches
Scale — select all notes that are members of the chosen scale
Highest/Lowest — select the highest (or lowest) note of every chord
Velocity — select all notes within a range of velocities
Beat position — select notes that begin at a particular rhythmic location within a bar, and then optionally at multiples of that position
Duration — select notes within a range of note lengths
Nth note — select every Nth note, with an optional offset
Active/Inactive — select all notes that are unmuted (or muted)
Random— randomly select a fixed number or a percentage of notes
Also, note slicing should be a thing.