I'm not sure if its a bug or not but it does seem to be game breaking:
When you get Madora or when you get Way of the Warrior 3 and learn Phoenix Dive you can use it to dive into rooms/buildings that are locked and would normally require keys without opening the door. Then you can loot as you please and then Phoenix Dive back out. I have not found anywhere that I cannot use, i was able to use in every room throughout town.
