This is a fantastic idea, but I do not think that BMW thought of this. I believe that only the names and numbers transfer. It would be awesome if we got total integration between BT and navigation with address transfer as well. As an aside, do you know if any other BT/nav system (either factory or aftermarket) does this? You may have an original idea.

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2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input