If you’ve downloaded a map that has the auto-sell of milk turned off, you can turn this back on by opening /map/map01.i3d in a text editor and searching for “automaticallySellMilk” and setting it to “true”. The placeable mod “stopmilksale” will allow you to turn it off again without having to edit the map again.
Click here to download stopmilksale mod from modhub.us.