Distortion Correction Toggling with Unity and Daydream

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I'm trying to disable distortion correction for Daydream using the most recent version of GVR, however it does not appear this is possible. (Unity 2018.4.7). I tried used a previous release of the SDK (1.4) which contains GVRViewerMain which has such an option, however when building the project, it does not seem to do anything, which I suspect is a result of Unity's native handling of the Daydream VR SDK.

Is it possible to either reintroduce this feature in a new version of the SDK, or support using the latest version of Unity with an older release of the SDK? Thanks