I'd always wanted to do one in baseball... makes decisions on who to cut and who to keep much more interesting... you also draft each year looking ahead. I would asume you need a bit larger of a rooster so you can have room for injuried players so you don't have to cut that super star who has the season ending injury. again speaking from baseball... ive seen folks keeping anywhere from 4-15 roster spots from year to year. Would be lots of fun. Only tried hockey once and even though i enjoy watching it more then a baseball game, i found the hockey league not as much fun as baseball... But it was a bad league where nobody would even other to reply to a post let alone both to reject/accept a trade offer.