FWIW, the car CAN lock itself with the CA remote inside. Mine has done it 3 times now. Each time, the fob was in my suitcoat pocket which I hung on a hanger behind the driver seat, closed the rear door, and the X5 locked itself. Luckily, each time it was in view of the satellite, so BMW Assist could unlock the doors remotely. If I had been deep inside a 3 story concrete parking garage, though, I would have been SOL. So now I make sure I always have the deiver's door open before I shut the rear door.
Even so, I have become addicted to CA. Every time I get a loaner without CA, I miss it.
2014 535i MSport Space / Black, ZCW, ZDA, ZLP, ZLS, ZPP, H-K and 704
2015 X1 28i xDrive Alpine / Black, xLine, ZCW and Ultimate
2015 X1 35i xDrive Black / Black, ZCW, Ultimate and Xenons
2014 328i SportWagon
2011 535ix MSport
2011 X5 35D
2008 ///M3 Vert
2008 X5 3.0
2007 X5 3.0
2006 X5 3.0
2006 550iA SP
2003 540iA M-Technic