Bind target markers to some keys (I use F1-F8), and mark up targets before heading in. Concentrate the majority of your damage/threat on the main target, while using AoE tools like TC/SW/Cleave. If the dps pulls one of the targets off you that isn't the primary dps target, it's their own damn fault. If they want to bitch you out, bitch at them back that they aren't following the kill order. It's something the DPS is going to have to learn to do for Cata anyway. If they die, they pay the repairs. If they kick you, who cares? You were doing the right thing, and you have a 3 second queue.
Also, I wouldn't save SW for runners, as one of the posters above suggested. It's better to just learn to tank properly than to control runners with a Shockwave.
Kathy, I said, "I'm lost" though I knew she was sleeping
I'm empty and aching and I don't know why
Counting the cars on the New Jersey Turnpike
They've all gone to look for America