As of right now overwatch is a useless mechanic in the game for players. You set up a trap and then some new enemy spawns in and all your guys shoot at it even though they are not in range or they have to shot through buildings.
My suggestion is let use set a range with a slider (that can be locked) or a preset set of distances (that again can be locked) or as I’ve seen others mention a cone or field of view. Anything is better than the current system.