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A nice feature would be archive skip, so we could click a button and be on the next archive rather than going across images first.
Press End (last page) and then Page down(next Page)
That should skip the archive.
By pressing End, Comix starts extracting all images up to the last, which might take a while depending on archive size and compression though. Something like CTRL+End or CTRL+PgDn to skip over this process sounds reasonable.