Thank you for your answer. It is interesting however it does not solve the actual problem: Biab doesn't seem to understand minor keys like it does major keys, this is just a display option, not what chords are played.
With the toggle off, I type in 1 and I get a C. I think that means Biab plays a C, NOT, a Cm. With it on I type 1 and I get an Eb. Indeed, a C is more suggestive than Eb as to what i wanted but a C is a C major chord as far as I understand, and still not the more romantic C minor.

When I type in 2, in the key of C minor, I should get iidim, meaning D diminished. Instead with it checked off I get a plain D (major) and with it on, I get F, both being major chords, neither diminished flavor. Am I missing something? It is my understanding that https://en.wikipedia.org/wiki/Diminished_triad sound/feel different than major triads.

More specifficaly: Ddim, which is what the the 2 chord in C minor key should be has the notes D – F – Ab. I get that any permutation of these would be fine, even if by another name. HOWEVER, Biab with the setting on gives me either the F chord, which has the notes F, A, C, while with the setting turned off it gives me a straight D chord, again a major. The D chord has the notes D, F#, A. See, neither of the two results has the note Ab, but instead A, leading to a musical dissonance if I try to make chord progressions in C minor.

I would love to use Biab to make minor chord progressions, using functional chords, however as it is right now I can't use it that way, and I am forced to always write in the chords by name instead of referring to their functions.

Thank you very much for your interest! I really hope this gets solved, at least in the next version if not through a patch.