Unity 5.2.3 is out !!

The target eye: none feature finally seems to work, sorta. If you disable mirroring in the first frame then it crashes outside of the editor. Make sure to do it in the second frame like this (confirmed it has to actually render a frame to the Rift before you can set that property, if your camera is disabled it still crashes):

 
IEnumerator Start ()
{
        yield return null;
        UnityEngine.VR.VRSettings.showDeviceView = false;
}

That code turns the start event into a coroutine automatically, and delays the execution after yield.