At the risk of sounding anal would a tunnel tidy be a useful wheeze? I have lots of rubbish rattling around under the seats and would welcome something that hangs over the tunnel, fitted around the gear shift and weighted each side to hold it in place. I realise that a door pocket is the obvious answer but I don't have one.
Perhaps along the lines of the Caterham one.
http://www.softbitsforsevens.co.uk/page42a.htmlPerhaps John Taylor could come up with a quality item.
I think it would be especially useful for M3W owners where space is at a premium.