Grats on the 07 e90. The wheels and tire section of the forum has gobs of info on offsets for staggered setups, I have been reading up on it a bit lately as I am about to be in the market for 19s as well. Rummage around in there and you are bound to find the information you will be looking for.
Unfortunately the non-idrive (not sure if idrive is capable either) will not play music thru bluetooth. You have to use the aux/usb jack under the center armrest.
Your question about coding is rather vague btw.
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