The documentation for selection rules is pretty much in the Advanced MakeMKV usage section of the forum. You can tell MakeMKV to not pull any subtitles, but grabbing a specific audio track is not possible by the rule alone.
The is no way to tell the diretor's commentary from other audio tracks since it's not marked in any way. In some cases it has lesser audio quality but there's no flag or anything.
MultiMakeMKV: MakeMKV batch processing (Win) MultiShrink: DVD Shrink batch processing
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