I believe that action buttons are part of the foundation of a business. They control business logic, and actions you want users to be able to take repeatedly.
Ideally, custom apps can add buttons which trigger the underlying Fibery Buttons, and not rely on custom scripts and actions. This way actions are logged, and are editable by the user.
I tried asking the AI to do this explicitly, and it told me it is not possible. I even gave it the button ID.