Start the engine without the key fob inserted

[youry]

Six months into owning the 2012 E70 (without comfort access) I found out I could start the engine without the key inserted in the key slot.
It happened today when I parked, removed the key, and seconds later I decided to restart the engine. In my rush I didn't realize I was holding the key in one hand while with the other hand I cranked the engine. I was puzzled.
Did a few tests and noticed there are about 6-7 seconds after you remove the key when you can start the engine without the key in the key slot. Is there any a way to make this a permanent "feature"?