I lovesors my FEC-100. I also wanted the ability if i so chose to get some additional smoke flavor into my product.
I made the easiest addition of all time and put a little expanded metal on the firebox using the existing screws. I have zero-point-zero-zero metal working skills and I was able to cut it with my dremmel.
Here's what it looks like. Similar modifications can likely be made to most pellet poopers if you want some extra smoke or you can always use a smoke box, foil pouch etc.