Fix interrupted cast please!

I'm sure this has come up before, but I figured I'd try.

I LOVE to PvP as a healer, but it's really unfair to get interrupted with every normal attack. I'm usually a WhM and can barely get any heals off, even with surecast. Can't we change that and just add a PvP ability for every class to interrupt every so often on top of the class's stuns/knockbacks? I think this would add more teamwork/skills to PvP and be a lot more fun.

Oh, and a Black Mage spamming aoe sleep needs to be looked into. =D