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As it says, for the powers which don't auto hit can you use a witchfire power when you are required to snap shot, and if so can you also use them to overwatch?

I believe witchfire says it is used in the shooting phase so snapfire yes, overwatch no.

As long as it uses a ballistic skill, as you cannot overwatch non-BS weapons except templates

Witchfire states, used during the controlling players shooting phase. so yes to Snapfire if you have the Warp Charge, no to the overwatch (Wrong Phase)