You already did that for the "instrument automation device":
If you move a slider in a vst gui, also the slider in the instr. automation devices moves.
Not so for the "instr. midi control device".
Is it possible it will move, too? For example, if you using pitch bend ? So back messaging, just like the vst parameters?
And also add such listener to API?
And disable default behavior that renoise writes midi pattern automation data, if there is a midi control device existing on that VSTi instrument?