From my experience tanking , there are PLENTY of tools to never loose agro on leves, nms and exp grind.

Now behest is a diferent story, it depends on your group really.I mean , the mobs die in less than 3 sec , whats the point to try and tank?I usually just toss wardrum/warmonger/barbaric yawp when ever theres no agro near .Trying to voke mobs that die before they have even landed 2 hits is a waste.

Of course im speaking of the normal many people behests, on low man behests you just tank like usual.

In regards of enm generation is fairly easy to do so with the right skills, as long as you understand what gives hate and what not.Now , just becouse it works it does not mean is good.Personally i find the hate mechanics currently in place to be poorly implemented.