In Werewolf W20, how does dice splitting work with no-roll Gift activation?

If I have a Gift that says, "spend a point of Gnosis: stuff happens", can I use this Gift while performing a normal action in the same turn ? If so, how would dice splitting work in this case — since the Gift does not require a die roll ?

For a more concrete example, can I activate Hands full of Thunder (spend 1 Gnosis: infinite ammo for the rest of the scene) and fire my gun in the same turn ?