Yes and no. I think that any other powers that are added should be first talked about and if a power in game can do it, use that power.If you have power that is not in the game and no other power can do it, then you write up a new power and get it done. The new power would have to be looked over by the board and reasoned out, but I think it is better to have limited way to change than none.
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See my hands. They are the bigest hands I know of. They are good hands. They are strong. They are hard. I will use them to build a better world, but I can't do it alone. Will you help me?