Ok, done both the hallway, and alcove strat...both were viable--I'm even leaning a bit more on the hallway one, right now. Still, in Shadow Priest mode...it was definitely easier to keep the healer out of harm's way, in a balanced melee/caster group, and I could see better, when a mob was taking an interest in me, and counteract more quickly. I also noticed that my Shackle spell was a lot more useful, because cc was less likely to get broken, on a lone mob--particularly the hunters.
Still the LOS alcove works just fine, as long as tank is allowed to get aggro, dps has a clear kill order, and interrupts are used. Plus, once initial pull/aggro is set, it probably helps tank for the rest of the group to get out of the corner, and spread out--inside the alcove...this even gives the tank, or someone, time to mark at least a skull-at-a-time, for impromptu kill order.
-"Just like a buzzin' fly, I come into your life, I'll float away, like honey in the sun..."--Tim Buckley