Greasy Fork is available in English.
Allows to find missing relations and entries with wrong episode/chapter count
< Commentaires sur MyAnimeList (MAL) Track Missing Relations
It's not really possible without completely changing how the script works and without dramatically increasing the overall scanning time. So the answer is no, sorry.
Options For Type
Could an option be added to hide by type? I personally only really care about distinguishing novels from non-novels, though there are several type categories for both manga and anime.