Can we control multiple parameters in same plugin with single knob widget using scriplet scripting or rack scripting. Controlling knob parameters with stepper button so we control at a time 1 parameter only.
I don’t think so
You can, however, create several widgets, add them to a group so that they will be linked, and hide all but one. That way you’ll move one widget but control multiple parameters simultaneously.
You can certainly do it with a rackspace script but it’s generally better to use multiple linked widgets as suggested by @vangrieg
That way it’s easy to set individual scaling curves for each widget visually as well.
Just to be clear, you can mix/match so you can control multiple parameters of different plugins as well from a single widget by linking (or by GP Script)