[Jaws]

I've looked for solutions to this one, but maybe my search-fu isn't up to this forum's needs...

In any event, there are some metadata fields that I would like to fill with a blank or a zero on bringing a book into Calibre. For example:

I really, REALLY don't care what some other rating system has given a book (especially since most of the "ratings" imported are way, way off — the downside of crowdsourcing for academic books). Neither do I care about the (usually inaccurate, and certainly not up to a research library's standards!) "tags" and "IDs"; in fact, I manually remove all of this data, especially for "later edition" books (like, say, any edition of a book from the 1950s that includes a "new cringe-inducing-celebrity foreword"). I'm most annoyed by the "date" field, because "import into Calibre" date is not "acquisition date" or anything else meaningful to me... or for other purposes.

I've been unable to find a way to selectively by field ensure that the irrelevant metadata is zeroed out or blank, but still import other relevant metadata (like the author's name, year of "publication," etc.). For example, the best I've been able to do with the useless "Date" field is limit it to the day of the month, a simple number that's less of a pain to swipe away by hand. Every time. And there's apparently nothing to be done with "rating" or "tags" or "IDs"... unless I'm missing something.

Am I missing something? Or is this worthy of a "metadata extension"?