Tools/Weapons could weaken over time and need to be sharpened with a stone/wheel/windmill powered wheel
EZ mode = Tools used for butchering/Weapons can only be used if they're not "Broken" they would pretty much have the same durability as armor and but could be repaired when they reach 0
Hard mode = Same as above except quality slowly gets worse.
I came up with this trying to think about things that would fill out the windmill, any other brainstorms are welcome if someone wants to spout something off.