I use WW and Bloodthrist as my main dmg but i use slam like he said between attacks so i never really lose a second on dmg but i use a fast off-hand weapon for the rage management so im not sure why you should'nt use slam without a enhancement shammy but i use it alot in raids and i hardly ever am  left without rage.....

Yes i am fury spec warrior and have been for years now so i have a little insight on the subject

P.S i do about 800 dps in raids GO FURY!!!