So it seems to me that true shapeshifting, does not really reflect shapeshifting as we have seen it in the dresden books, I can't remember anyone ever turning into an inanimate object. is removing the ability to shift into inanimate things worth a -1 to the refresh cost? It seems like it removes a large amount of variety and utility from the power, but it's not something most people with shapeshifting would usually use.
Some of what that is getting you is the ability to rewrite your skill list at will, and excuse to buy modular abilities.
On the other hand, if your high concept is Awesome Animagus, and you buy True shapeshifting, you can only shift into animals, but everytime you say 'If only I could turn into a hedge" (plant not animal), or "What we really need is a ladder, if only I could reach", you hold out your hand, and the GM should place a FATE point into it...