I was thinking (again) that it would be fun to make more use for oil in the game.
OIL LAMPS:
3 iron bars 4 nails 2 fibres (example)
It would be a torch that would use vegetable oil as its fuel. It would last waaaay longer than a regular torch.
Another thing: you could use Oil Lamp with some sharpened sticks or stuff and make oil lantern that could be placed inside a mine. Many people use mines as their storage area and its so bloody dark in there and fireplace (that has very short lifespan) is the only way to lighten it up.