It would be very helpful if there was a an audio delay setting for Private Listening.
You see, when I'm using Private Listening, the audio stream is a bit ahead of the video stream. I believe this is due to the additional time the TV takes to process each frame of the video stream.
To compensate for this, many TVs include an audio delay setting. However, this only works for audio that is passed to the TV itself. When using Private Listening, the audio stream is passed directly from the Roku to the remote or app. Thus, there's no way to adjust delay to compensate for AV Sync issues when using Private Listening.
The adjustable range wouldn't need to be large, maybe just from 0-100 milliseconds or so.