Sometimes when I fix metadata and/or is viewing some books, I start with searching for the author, series (or whatever). Every so often I get, besides those books I'm looking for, also some other books that matched the search.
At that time, it would be really nice to simply do a right-click and choose "hide temporary in current list" and it's gone (until I search again and/or clear the search field). Then I can save brain-fuel and only focus on those books I want to contemplate about or do something with.
It's not vital by any means (and using the advanced search can probably minimize the hits, just not as easy), simply something that I would find helpful at times.
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And... for Calibre in general....
