allow us to use say, 5 iron nuggets and 3 string to make a cowbell. then let us pick up the cowbell and right click a dairy cow to place it on her.
it can only be equipped to cows that are currently giving milk, and it is dropped and recoverable when the cow is slaughtered.
either that, or fix the damn game so i dont place barrel on the ground whenever i right click a cow that doesnt give milk. seriously you know damn well why any player would right click a cow with a barrel in hand. when you have even a small villages worth of cows, there is no way in hell that you can tell which is giving milk and which isnt.