Regarding your custom use-case, @samriccijr, i’ve added some extra MIDI Controllers to the list, including those you are using (CC2, CC71, CC72, CC73 & CC74 in your SFZs. I think it should be more than enough for most use-cases.
If needed, a customization mechanism could be implemented. Something similar to what it’s currently implemented in fluidsynth engine.
Best Regards