None. The 4:3 and 16:9 support the same number of characters on screen, and use the same iBus commands to place them around the screen.

I think what the compatibiltiy table, if you look at the patterns in it, is telling you is that Mediabridge does'nt support non-nav 5 series/ 7 series/X5's as they use a MID.

Best to ask here. Usually gets a response within a day.
eas | Official DICE MediaBridge iPod/iPhone Multimedia Hub Q/A thread - E46Fanatics