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This is rather straightforward. In Avatar, the swamp benders used waterbending to speed up their boat/canoes. Well in minecraft, even for waterbenders it can be a pain to cross large large bodies of water. When in a boat all they have to do is equip this ability and they will speed up. I am thinking maybe hunger decrease or maybe the speed depends on time of the day. Suggestions and feedback are welcome.
It could make more sense in RPG. Making it so waterbenders can only go a certain distance before being fatigued and thus will use boats and bend the water to go faster.