what can you do with true shape shifting without the use of modular abilities. If you take the form of a wolf or tiger, do your teeth not change because you cant buy claws?, Do you transform into an especially small bear to avoid hulking size? Do you become an especially large flightless pigeon because you cant buy being tiny or the wings power? I would think you become exactly what the creature you are becoming is...
Listens to wind transforms rather obviously as a supplemental action during his fight with shaggenasty. Becoming a small bird and taking flight with the creature in hand, all in one action.
Modular abilities takes a full action to complete as written.