No, there's no extra deduplication features in v2.0b7.

I did just have an idea, though: ID3v2 allows for an application-specific file ID. If emplode modified this when you loaded the file for the first time, and then stored it in the *1 file, it'd give us a very quick way to check if a file was already present.

Don't know if this is feasible, though. For a start, it means adding ID3 write support to emplode. This is no bad thing, OTOH.