First, I'm having a blast with 1BD! Thanks for the time and effort you've put into it. It works a treat for me! I run it in Lubuntu 20.04 with an i5 3.60GHz CPU and 32G of system ram. I haven't run into any problems with stability or recording/saving/disk operations at all. I like the clean midi export which I also import into Renoise 3.3.2. Which brings my first request.
In Renoise there is a user-created tool called ChordLord. Basically, one chooses a key and mode, say key of E and Pentatonic Minor. The program shows all the available chords that fit that key and mode in a grid. The user then chooses the chord from the grid they want to add to the track they are working on and clicks to add it. It saves a lot of time and tedium not having to choose each note for a particular chord and enter them one by one. Here is a link showing the program: https://www.renoise.com/tools/chordlord
My second request would be that when loading or saving a file that 1BD remembers the last directory that was used. It saves time not having to hunt down directory tree each time.
Keep up the fine work. I can't remember the last time I had so much fun composing tunes! Best Regards and Be Well.