What I've done with random pickup groups: have all dom/w besides one that is of hand or land go do wahtever they do. Rush in and protect the 1st line of archers as much as possible. That's about it, none have been special and the most points I've obtained is 13.5k or so. But the first group I did it with the guy had gotten one helmet and an inferno seal or something like that at the golden bazaar. Not in our group though