In the current version of Hookpad secondary diminished chords are always fully diminished. While that makes sense when applied to a minor chord, major chords usually have half diminished secondary diminished chords, since these are usually borrowed from the corresponding major scale.
I am aware that you can borrow half diminished chords from parallel modes in Hookpad, but those don’t indicate the chord function at all. Having a #iv° instead of a vii°/V implies that the diminished chord was just arbitrarily borrowed from lydian without serving any particular function.
My suggestion would be to implement a button that lets you switch between fully diminished and half diminished chords when using the secondary vii feature.
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