As i said, i didnt do a lot of arena, just RBG solo que...
2 talent points, that can be used elsewhere, for 1min CD reduction on Shield Wall that alrdy has a long CD is not worth, thats atleast how i see it.
If u want a bit more control and self heal:
https://wotlk.evowow.com/?talent#LVZGx0sZVhprtbzidcdsGo
And, from what i know, prot war is all about catching and bursting someone in Concussion Blow and Shockwave, so going for more control might not be that usefull since it can cost u, aka not beeing able to kill someone.