I think this is all you would need in a vst ?
so you can enter the chords directly in the track (zoom track in for tight chords),
Generate Button to give all the generate options including MultiRiffs,
tracks just drag n drop into DAW along with the realchart midi,
maybe you could have the notation/tab come up on double click a realchart track ?
you can easily add extra realtracks/drums to a recorded session or generate up the complete style.
Basically to keep it as simple as possible to avoid any crashes.