Often after attempting every permutation I’ll find a unique sounding chord (or one I use a lot) and wish I could save it to easily use elsewhere.
Ideally there could be User Sets or Favorites tab added to the top row beside progressions.
Then I don’t need to remember IV(add6add9((no3), vi6(add6(n05), or whatever. 
As the chords are saved as degree + embellishment, rather than f#m(add6)(no5)/A they can adapt to the current key.
There’s already 20x12 chords in the Tone Sets section so it’s code could be reused just with chord saving functionality.
I realize favorites could be saved in a separate project, but this loses functionality like in context preview and is a workflow killer.
Cheers!