Can we have tank aggro buffed?

I never understood how multitarget tanking worked with some classes, warrior for example. In the old day that one spell had a dumb cd, then came glyphs of cleave and I forget the name of the other one, The Bear tank has thrash? Or swipe? I only tried tanking, and failing, a few times on my Warrior. Then again that’s probably why I’m a filthy DPS, except that one time I tanked heroic Paragons from 7% on this rogue back when I wasn’t lazy.
I would think that they should buff some tank aggro capabilities though