well, here goes.
i would say you have 2 very good options with a WSM for cooking brisket.
1st, cook it high heat. it'll take @ 7 hours from lit chimney to plate.
2nd, lo n slo. fire it up after the game, minion method. once you have it locked in, it'll stay steady for a good 6 hours anyway.
-In memory of a friend.
avatar by grillman. patent pending.