First:

Dio's peanut gallery is reporting sneak failing for thieves and assassins. This a new change, something that's always been around, or a collective dose of purple crack?

Second:

What stats on the stunner's part (str? dex?) influence the likelihood of "stun" successfully knocking someone out?

Third:

Same question as above but with cranial. (I know target's headgear plays a part, this question is just about the cranial-er's stats).