Option for sixth chords; roman numerals of sixth chords

Hookpad considers sixth chords to be minor seventh chords in first inversion. For example, E6 in the key of E major would be vi6/5 in hookpad. Also, the only way to get sixth chords in hookpad is to put a minor seventh chord in its first inversion. I want there to be an option to add sixths to major chords. Also the roman numerals to be changed to Iadd6, IVadd6, etc.

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add13s are automatically displayed as add6 when the seventh is absent.


As a bonus, add9 and add13 together imply 6/9 chords when the seventh is absent.

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