That's not just the fault of the class design though, at least as far as stunning goes. I think it's great that paladin has a stun that doesn't have a cooldown and could potentially be spammed, but it's abused in the form of bringing the class to JUST stunlock monsters instead of building encounters around the cooldowns in a way that makes sense.

Otherwise I agree it shouldn't break combos. An interrupt is supposed to be just that: a special ability you activate to interrupt what your opponent is doing, not what you are doing - but I fear the tradeoff would be putting a CD on it. I'd be ok with that if they could fix some of the encounters that are practically unwinnable without a paladin stunning.