this isnt to usefull for crystal pvp, but it could be for more legit kind of pvp.
The idea is to add a health based smart feature to the auto offhand which automaticly switches between different items (totem of undying and shield) based on health and cooldown, when shield is on cooldown it could switch to a totem for safety or when helth is low it could quickly switch to a totem untill it poped and then switch back to the shield.
this could be helpfull with some kind of auto shield addon to kill aura which could try to block incomming attacks automaticly