But that's just it, what's coffee making got to do with brewing, other than the name?
I'm not trying to start an argument here, honestly. I just can't see how anything other than a hint of coffee flavor might be a good thing to a beer, and to that end, I can't see how grounds are going to be beneficial. Like oversteeped tea, how is leaving the beer on the ground not going to impart unwanted sour or bitter flavors that most picky coffee lovers avoid?
While I am by no means an expert brewer of either coffee or beer, I just can't imagine that if I really needed a coffee flavor in my stout I couldn't just add a couple tablespoons of instant coffee at, or near, the end of the boil for the proper effect.
Has it been tried? I just don't recall it being discussed before.
Sorry to threadjack, OP.