You guys are trying to use USAF terms, rules and attitudes to solve a dilemma created by specific airlines.

The simple fact is that most airlines have the philosophy that there can only be one PIC during a flight - the one who signed for the aircraft. That's the way it is on their aircraft and that's the way they made their rules for applicants.

You can try to explain how the guy in the front seat is logging Primary time while the guy "demo-ing" the cuban-8 from the back seat logs IP time but they're not going to buy it. If you show up thumping your chest about what a valuable "resource" you are and tell them some of your PIC time was logged with an IP on your aircraft showing you his techniques, my guess is they'll show you the door.

But, I've been wrong before.