Putting the power to not only kick players from a group, but to also inflict the penalty on them in the hands of players is a non-starter. It's not worth considering or suggesting because it would never happen. I often /facepalm when I see people make suggestions like "scrap <system I don't like> and rebuild it like <rants on with overly complex system>". If someone is going to make a suggestion for something in an MMO, they need keep it within the realm of things the devs would reasonably consider. Otherwise they're just making noise.