For example, there were at least three beta patches where the official changelog mentioned the stacking of identical non-equippable items had been fixed, but every time I had checked, there were still "problem" items that didn't stack.
Nails are so annoying. And I don't grind my skulls (7 different types, really?) to bone dust for pretty much the same reason, even if it would spare me weight.
Pillows (for knifing) would also be nice.
So yeah, still a few to go there.