Even with lag, I bet you can set up some sort of macro system on all toons that would work.

I've noticed while reading up on the classes that a lot of them have a mez or stun that removes them from AoE damange.
I'd think you could have a macro on each non-CC toon to:

/autoattack 0
and the 2 stop-casting and clear queue commands (I'd look them up for you but I just aggro'd my kids!)