Long time podcast listener & site lurker. I heard Jeff talk about how he felt free aim doesn't work all too well with the game. Though I played through the story on free aim, I do kind of agree.
But I discovered that if you hold the Right Trigger half way it brings up the cross hair & your characters goes into a kind of combat stance. It's like an alternative aiming but without going in over the shoulder like the Left Trigger does & it also makes the player move quickly. It can make it much easier to track targets & shoot whilst moving.
Maybe I am crazy & I missed some big tutorial, but I had no clue of this function!