1. Don't think that's possible.
2. I think you can only have an MDI or the CD stacker as they use the same plug on the radio. Perhaps if you had a soldering iron.... (not sure). I've retrofitted an MDI and my pre-existing 3.5mm AUX in jack has since stopped working.
3. No, bluetooth is just streaming audio, you have to skip songs via the iPhone controls. If you connect the iPhone via MDI you can skip via the RNS screen or steering wheel buttons.
4. Ask the eBay seller.
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