Is there a way to add mM7 and dim7 chords?

[SilentPaaw]

How to enter m#7 Chords?

That is unnecessarily complicated. You can easily get a mM7 chord on any diatonic scale degree by simply switching the key to the corresponding relative mode and borrowing the tonic seventh chord from Harmonic Minor. So to get a cmM7 in Bb Major you just switch the key to C Dorian and borrow cmM7 from Harmonic Minor. Also in which universe is D a fifth up from C? You can access mM7 chords on non-diatonic scale degrees by switching the key to a parallel mode, then switching to relative Lydian an…