I think having the checksum for the file as it was when it was first imported can still be really useful. I had some plans for something like this for myself.
The context is the key. I regularly grab free books off amazon. When I do, it's not rare that I grab a whole bunch of them in one sitting. That collection of books has gotten pretty big over time. After downloading the books and importing them to calibre, I clean up the tiles, the authors, do the cover thing... basically I work so much on them that on the next batch import, I end up with with duplicates. Having the original checksum (to prevent reimporting books I already imported) would be great in this case and an up-to-date checksum would be useless.
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