From this list
Submissions
Modify/remove torrent within X minutes of submission
Field for group name
Field for series name
Field for AniDB/Anime News Network ID #s for linking
I would add more fields since reading the titles are quite tedious and could be easily normalized.
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Type: Already exists in current version
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Comment: Already exists in current version
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Website: Already exists in current version
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Number: Could be eps number, movie number, manga chapter number, etc
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Age rating:: General, Adult, Hentai, etc
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Resolution: 720p/1080p/etc
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Video Encoding: XviD/h.264/etc
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Audio Encoding: mp3, AAC
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Compatibility: PC/XBox/PS3/IPhone/etc
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Source: TV/DVD/CD/Streaming/Mangas/etc
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Reencode: yes/no (or could be merge with Source)
Since the language seems to be "integrated" in the category, I would suggest to Create Anime/Manga/Drama/Etc categories without binding the languages to it and add those 2 new fields:
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Languages: check box with: Japanese[], English [], french [], ..., Other [____]
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Subtitles: same as languages.
So we would have those simple categories and rely and the other fields:
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Category: TV, OVA, Movie, OST, Manga, Live Action, Art Book, Music Video
I know it would be a little bit more complex for uploaders, but for usage it would be a lot easier. Also, for the sorting it would be interesting, you could display the results in many different ways (like grouping or making tables with real-time sorting). I probably forgot some stuff like for batch, but I think you get the idea of what I would like.