looking at the number of forum posts about wanting to surround yourself with dumb zoos when launching subclasses. ZOS i think you needs to start working on changing the mechanics of pets in pvp, especially on BG. Two sorcerers are already turning a 4x4 into a farce. how much you have to be inadequate to drag pets to BG, I do not know how to play as a sorcerer. But the fact is, they do it and will do even more when subclasses appear.
If it is impossible to completely remove pets, then why not limit their life time to 10 seconds, completely remove the colosseum and make them completely non-priority targets for skills, even if they appear in the scope. So that the skkils fly into the owner and under no circumstances into the pet.
This will be easier to do than an adequate aiming system with a rigid fixation on the target.