Hmm. I wouldn't think that changing lanes would cause that much of a load from the power steering pump. Most cars and even large trucks can change lanes without much effort without power steering.
Too bad you have an 06(serpentine belt). Anyone with an older car tried removing the belt for the PS pump completely? It sucks but might be a good place to look for gains.
What about having a hydraulic(or pneumatic) pressure storage tank and having the pump charge the tank on decel? Then you could have power steering without the constant load? That won't work. Power steering systems run an open loop that flows constantly and freely when no turning is done and loads the pump by restricting the exit to one side of the rack to create pressure and the assist.
Sorry, thinking out loud.
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- Kyle
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