Re the 3rd row seat belts and their retaining slots (when retracted back into the rear roofline), never had a problem with these staying in to keep them out of the way......

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2008 E70 3.0D Msport
Titanium Silver, Nevada Black Leather, Brushed Aluminium Trim, Brushed Alu Window Surrounds, High Gloss Rails
20 Inch MSport Alloys, 3rd Row Seating, Heated Seats, Xenons, Media Pack, IPOD Adapter, Dimming+Folding Mirrors, Shine+Protect Pack