Okay first :
Your first question i don't understand what you are asking here ? Since you cannot change spec mid fight but only when out of combat.
Your second question is you can do 2 things here give the tank a head start, and then pop bladestorm, i know you probebly want to pop bladestorm straight away to get all procs up. Let the warrior tank check his rotation i have no problem what so ever to keep aggrro over my 2 ARMS warriors bladestorming my target.
I haven't checked out how Fury is in 3.3 but i was always a Big fan of Fury since i levelled 76 levels with it but have an offspec arms now till i get my second 2 hander from ICC >=). Main spec for me is tanking. For my knowledge in Fury the cap is still
At level 80 with 3 points in Precision you need 361 hit to never miss a special/yellow attack.
At level 80 with 2 points in Weapon Mastery you need 148 expertise rating for your attacks not to be dodged.
And you don't want to stack Haste as arms or fury warrior try stacking in random order .
+str / +crit / +ArP
Shamarice, Enhancement Shaman ( Active )
ShadowBumble, Warrior Tank ( Retired )