Yes, the heavy weapon attack only takes the one Action, but you can only make one attack a turn. The other Action is free for whatever. (A lot of times it is for Focus, but it can be for anything, including Move, Focus, Evade, or some magic use.)
One thing that contributed to the confusion is that anything that requires a roll can skip the roll as long as:
- It's not in combat.
- It's not time critical.
- There is no penalty for failure.
For example, someone with the Healer Trait has to roll a Test to see if they can heal their subject. If they get a success, the subject gets 2 HP back. If they fail, nothing happens. This action has no penalty on failure, other than the lack of healing. Therefore, in a time critical or combat situation, the rolls must be made. But, out of combat, there is no point to make the rolls because you can try as many times as needed to get the healing done. So, to keep things simple, you just don't have to roll in those situations.
With that in mind, for the Shamanic Warrior trait, how about this:
- The write-up it has doesn't change for what currently exists.
- We add the following sentence to the initial paragraph: "If both Actions in a turn are spent making the request of the spirits, the Test is an automatic success."
- Note that the above above non-combat, non-time-critical exceptions still exist.
This means you can still invoke it without rolling, but it takes the entire Turn to do so. Or you can roll the dice and hope for two successes in a single turn.
Will that work for you?