Two requests:
1.
Grab metadata from itunes (primarily cover art, since they frequently have hi-res cover images). This should be fairly simple. Currently I use
Ben Dodson's iTunes Artwork Finder (
source), but it would be nicer to automate it. Given that itunes frequently has two covers (smaller and larger), it might be nice for both to be available (though I only use the larger covers myself).
2.
Temporary columns. Column names are prefixed with @ instead of #, and only the column names are saved to the database; the value is only valid for the current session (or is discarded on exit). Only allowing yes/no columns is sufficient; I simply want to have multiple sets of temporary markings, so the list of books whose metadata I rejected doesn't replace the list of added books (and given the frequency I have this issue, I find it hard to believe I'm the only one).
2a. Deeper integration would allow for even more useful things, such as automated session-based lists for updated metadata, rejected metadata, new books, new/replaced formats, new covers, metadata updated internally (ie, by calibre companion), books downloaded from the content server.
tl;dr: see bold.