Without having hoster right in front of me this is going to be a bit of a guess, but I'll take a shot.
I don't believe you can have more than 1 disc id to a book id and in batch mode it shouldn't ask for a book id it should just assign one and it won't permit a book id of zero. If having disk id's is not important to you, you can try this.
Assuming your files are named thusly: DiscId-Track - Artist - Title.Ext, I think you can set the drop down boxes to Ignore-ignore - Artist - Title.(period after title). You can then give it a common brand name like "custom" and a common diskid or hoster will use a default one. Hoster should then automaticly assign 99 tracks per book id starting at 1. With 5000 songs you'll end up with about 50 bookid's starting with 101 and ending around 5199.
And book id's have no leading zeros.
I was kinda tired when I typed this so I hope it makes sense.
Sam
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