Continuing to experiment with 2.3.11 until 2.3.12 is available, this seems to produce usable but not stellar results and takes longer to process presumably because it is doing unnecessary transcoding:
order=ffmpeg ffmpeg-general=-async 1 -threads 0 ffmpeg-video=-ss 3 -vcodec mpeg2video -qscale 2 -r 29.970 ffmpeg-audio=-acodec mp2 -ab 384k -ac 2 ffmpeg-audioac3=-acodec mp2 -ab 384k -ac 2 ffmpeg-ext=.wtv ffmpeg-audiodelay=skip FixedResolution=true SkipCropping=true