- There are three chord symbols fonts, not 1. You can change the size of the Chord Symbols Music Text (sharps/flats etc.) separately from the size of the Chord Symbols Text. The beauty of this is that you have control over exactly how big the sharps/flats/triangles are relative to the root notes of the chord. This is sensible design, rather than an oversight.
- See above
- You can customise the sizes of superscript/subscript to your heart’s content, here:
- You can adjust the spacing of EVERY individual chord symbol by double-clicking on it in Engrave Mode and editing it, or by adding a global override from Engraving Options > Chord Symbols > Project Default Appearances > Edit.
I think that covers the lot, here. There’s nothing here that Dorico can’t already do; you just hadn’t figured out how to do it 