There is one type of basket that i have pickedup that doesntseem to be smeltable into firewood, i dont know if this is for a reason or you have over looked it? i know there are many baskets which could be the reason. also i have looted a few "flower baskets" that i think should be smeltable into firewood. Really love the mod its great to be able to scrap the worthless stuff that gets stored in random containers :D.