The wind at most sites does a bit of back-and-forth but it doesn't usually go all the way around in a circle very often.
Do you get a lot of dust devils? (If one goes over the mill it might crank around a couple times.)
So put a locking plug at the bottom of the mill and a little slack in the drop wire. Check it every few months. Unplug and untwist it (on a CALM day) if it's getting seriously wound up. (Or skip the plug, lasso the tail, and walk the mill around until it's untwisted.)
If you want to untwist it on a windy day you need a shorting arrangement to keep the mill from running away while unloaded or a manual furling mechanism.
The wind does a bit of back-and-forth. But unless you're in a very turbulent area it doesn't usually go all the way around in a circle very often.