Sorry, I am not an engineer so this is just my understanding. It seems to me that if you are not shutting down, only waiting, then you have oil pressure and flow. As I undertand it the problem arises when you shut down, lose oil pressure and oil flow, and then excess heat will cook the oil remaining.
If that is right then sitting at IDLE with the intention of returning to FLIGHT should not cause a problem. Or did I just misunderstand the problem?
John