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One noteworthy detail: Zotero doesn't appear to parse any other format than mods, at least when using unAPI. In my server access logs, after the request for the object (e.g. http://example.org/fedora/get/demo:1), the next request is for the mods format (e.g., http://example.org/unapi/fedora?id=info:fedora/demo:1). I don't see any requests for the various formats that might be available for that resource (e.g. http://example.org:8080/unapi/fedora?id=info:fedora/demo:1http://example.org/unapi/fedora?id=info:fedora/demo:1). This is using Zotero 1.0.7, I haven't tried the 1.5 preview release.
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