There will probably be a dozen posts by the time I get mine done, because this is a popular item:
Yes, it is mosly a pre-meal snack as it takes less time to cook than most low and slow recipes. However, it resembles meat loaf, so it could be a main meal, especially if you stuff it with something filling.
I don't really think it adds anything to the current smoke, however, it will add to the overall seasoning of the smoker over time.
No, it doesn't crumble over time (unless you cook the heck out of it). Cook the loaf to safe pork temp, and you're done.
There are so many variations to a fatty that are wonderful. But, they're also great just plain. Do a search, or just experiment. You will be pleased.