Does doubleshot affect thrown vials while wielding a sceptre and orb? I.e. if I throw a multi-vial would the doubleshot have a chance of procing? I ask for three reasons

1) Doubleshot applies only to ranged and thrown attacks and alchemists are meant as a hybrid thrower
2) Alchemists get a vial for doubleshot
3) I have not seen any thrown weapons that offer spell bonuses (indicating they are not really to be used by spell casters).

Any thoughts on this would be greatly appreciated.