Some thoughts in response to some posts
-Keep auto-facing, but remove suppression in automatic fire;
-Suppression occurs only when you manually barrage a target area; the barrage can be renamed "Suppressive Barrage".
Other ways to improve:
-Reduce turning speed of these weapons so while you may still auto-face, there is slower response to detected units in range;
-Turning speed can be increased as part of veterancy buffs.
This way, you get a unit that can suitably perform by itself, but certainly far less optimal than if you micromanaged it yourself.
I don´t care about the autofacing, but the autofiresuppression is just annoying. It adds nothing to the gameplay, just pure frustration. Doesn´t matter if it autofaces or not.
The "Suppressive Barrage" sounds like a good compromise.