If the targeting is selectable, then it would stand to reason that Professor Crater in "The Man Trap" forced his phaser to deliberately miss Kirk and Spock when he opened fire...
Perhaps once the target has been acquired, it lights up or does something to display to the firer that it has a lock and all they do is fire?
Perhaps once the target has been acquired, it lights up or does something to display to the firer that it has a lock and all they do is fire?