I agree. I wish there were tacticals and set bonuses that focused on an aoe build, but I'm a Madness Sorc so I'm slightly biased, wanting all that DoT and sweet lifesteal.
What I would REALLY like to see - as a Madness Sorcerer main - is either removing the target limit for Death Field or vastly increasing its radius. That, I think, would really define the playstyle for me, as we are a spec that thrives on DoT.