PVP with a coercer is hard but a lot of fun... i luv using their own pwr against them. Yes charm can be broken... they cast a debuff on you. But it can also just debuff other buffs and not your charm ... im not sure if it random or if it starts at the top or bottom of the maintained spell list.
Yes, you can initiate pvp with your pet, but scouts have an evad ability that can deaggro the pet off them, if it is not resisted.