Keep the stereo on without car running? Trying to listen whilst planting flowers, but it stops 15 mins interval and I have to turn car on and off. Both in in owner’s manual. . .
Ne’er mind, figured it out.
Well, don’t keep us hangin’!
Press the start button without a hoof on the brake 
car won’t start without brake on, just turns on ACCES.
Actually, good to know. Have had that issue myself. 
It’s one of those BMW things that are so secret they aren’t in the owner manual 