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I am not quite sure what the issue is and what kind of app you are waiting for. You can edit a single ePUB with Sigil without a problem. You can add any kind of tags you want. Official tags via the editor, unofficial tags via the OPF. The issue you apparently have, is that the Sony doesn't use a special tag for collections. It uses the standard tags to guess the collection AFAK. So, what do you want the app to do?
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