“You’d like to have a CC that toggles the Global kill dry setting on/off?”

Yes!

However, it would be helpful if we could assign global source controls for Program parameters (mix, in, out..)

For example, If I always want to assign a Hotknob to control the “P In gain” I have to assign program by program…

I have the hotknob controlled by midi (expression pedal) and use it to swell without lost the tails when going to heel position (in gain -60).