Certainly no need for the Cobb RMM; my experience is that it just feels tighter all-around, which, in a light agile car, would seem to be a plus. And as a firm believer in the "smoothness is 7/8s of speed" school of driving, I'm not beating anything out of the car whenever.
I doubt that Randy was referring to Cobb, and I no of no reports of a Cobb RMM causing any issues with a knock sensor.
I suppose I could say that "I don't see the need for a short shifter on a daily driver unless you're really beating ... it off the line all the time," but that would be unnecessarily judgmental.
I do know that many ST owners have installed the Cobb RMM and find it adds to a more refined driving experience.