With BOAC
But was that not for ATC slots? BA franchise carrier at the time and yes, push and hold for a remote stand to prove the airline ready on time. After X mins if slot still the same, crew to consider APU start and engine shut down. That was in the 90's with gas at bargain basement prices to today. Downside, stuck and oh so tech delay if one should not fire up or APU fail..............Still that was just a tug driver towing it back with ATC not happy.
So much more at stake now with the price of gas, but shut down on the active? From an Ops guys humble pov errrrrrrrrrrrrrm maybe not..........
Bored