Stormlash is active by default with 2 shamans casting it on cooldown (no overlap, of course). As far as I know, and I could very well be wrong here, there is no way to do the same with Crit Banner or Tricks. The best way to go about doing it is create another player in the sim that is there solely to provide buffs for you, like so:
Code:
armory=us,hyjal,pawkets
warrior=banner1
level=90
race=orc
role=attack
spec=arms
actions=skull_banner,if=buff.skull_banner.down
main_hand=shinka_execution_of_dominion,id=87176,stats=920crit_920mastery_2071sta_1380str,gems=500str,enchant=dancing_steel,weapon=axe2h_3.6speed_14525min_21788max