So we now have two model S's in the family. I have two questions: 1. Is there a way to make the keys interoperate with both cars. So rather than having different key fobs for different cars can you simply just have one fob that operates two cars? 2. I'm thinking of swapping the wheels between both cars. Would the cars learn their new TPMS or would those have to be swapped as well? or worse yet reprogrammed by the dealer?