I don't use fx chains for fx chains, but as VST to ProChannel converter.
Sometimes 6 knob isn't enough.
 
Can we have another, maybe with 9 knobs.
 
OR if you are feeling really creative. Make effect chains modular, with choices of banks or 3, knobs and 3 faders. SO you'd load the FX chain, and under the Customise UI, you can have a have an option to select 3,6,9,12 knobs and 3,6,9,12 buttons.