I've seen it mentioned a few times that an AMNPS can be lit at both ends for double smoke production. Could I get some examples of what that might be used for?
It depends on how smokey you like your food.
Some like just a light taste of smoke & some smokeaholics like me like a lot of smoke flavor.
I suggest you try it both ways & decide for yourself.
I like more Smoke Flavor than most people, but that would be many hours of light smoke---Never Heavy (Thick) Smoke.
I lit both ends on my AMNPS one time, and the Smoke got too heavy, so I put the one end out.