What leo said. Its true that autosell works to everything in Wild. Except broken tools/armors, enchanted stuff, heads, etc...
~ @SillySilver
Have you tested it in the wild since i posted? There are limited items (that i have found) that DO sell... like cobble, iron ore, and redstone that will autosell. But most items wont. Ive tried spider eye, oak wood planks, stone stairs, arrows, dirt, bone, coal, flint, stick, no damage/no enchant/non fix stone pickaxe, torch, and rotten flesh (zombie brain) and they all just go back into my inventory.
I wish i had video software to show it, but really, its not working correctly.
Edit: if i manually /sell 500 rotten flesh, it will sell, but just wont do it automatically.