Encounter based AE is not a big deal, it's when you have adds outside of that. I also went the Agility line, and the AE Auto Attack is nice, but just doesn't feel like enough, you don't have time to hope it procs in certain situations, you need the aggro now. The best ability I could find for this was a combo of Reinforcement -> Assault line ( Siege at final skill ) which is basically an AoE non encounter based aggro snap. With AA's it's stll limited to every 2 min 10 sec.