I wish to be able to edit the look of the piano roll, changing the color of the notes so the naturals are white, and sharps and flats some different color, or being able to put custom labels on each notes (C, C#, Db, D, D#, Eb, ...)
The only program I heard of that can to this is Reaper, but it isn't free or or available on linux.
Here's a reference of what a 19edo keyboard may look like:

Is there any programs sequencers that can do this? Also, I'm open to any other suggestions related to this topic.
p.s. It would be great if the program supported Jack-Midi and Jack Transport.