SITUATION The spawn emplacement is gray but you would like to spawn here as Cold&Dark or Ready for taxi!
Put the plane on the grayish mark, set ground as altitude and quit the Location page.
Back to the Location page:
You will be able to set the On ground options like Cold&dark.
Dear Jet-Pack (IPACS)
This trick illuminated my mind: What if it was possible to set On ground options whenever you set the plane on ground? Even on the middle of nowhere!