Pacification does it work on bosses?

[Kitru]

also Stuns should be off-GCD(like lancers for example)for all classes that has it not just for PLD's to make interrupting more userfriendly and fun

The PLD stun is on the GCD because it has no CD, which is a *huge* advantage since it allows a properly played PLD to so interrupt mechanics that were designed for 2 people to take care of (like Ifrit's Eruptions). If you want it off the GCD, expect it to get the 20 sec standard CD that Brutal Swing is getting and that Leg Sweep already has.