That's how the jugg/guardian AOE taunt works. It's PB-AOE. I'm not sure about the sin/shadow one.
The shadow multi-target taunt is also player-based AOE. But yeah, using an AOE taunt on the claw is just not going to happen with my Powertech, who is also a tank.
I still think taunting is a suboptimal strategy. Whoever has the claw's attention has to kite, CC or take lots of damage, and neither my PT nor my shadow can CC droids. Why shouldn't that be whoever is targetted rather than adding an extra layer of complication? I like to have both of my taunts to use when the turrets come up anyway as they do massive unavoidable damage if they latch onto the wrong person and you can't get them both with one taunt.