Both XCOM2012 and Xenonauts have automatic overwatch systems in the sense that the player can't choose to do them.
Jagged Alliance 2 had a system where the player could choose which shots to make. If a solider had an overwatch opportunity, the game "broke in" and allowed the player to use TU, or pass, which kept the overwatch opportunity for later.
How do you feel about such a system? (Personally, I love it )