1. Start ARMA Alpha in development mode
2. Go to Option - Game - Vehicle freelook: and change it to "Enabled"
3. Start a random mission (which includes a Vehicle) and check that you have the freelook as default (you should have).
4. Close the game completely and open it again.
5. If you starts a random mission again you will see that the freelook option haven't been saved since you steer with the mouse now.