I am happy to retract my assumptions from a few days ago: fanfiction.net IS doing covers now!
Example url:
http://www.fanfiction.net/s/8070065/...e_Noble_Spirit
The image in this story is different from the authors avatar, which leads me to believe that by default, all stories get their author's avatar cropped for a story cover unless a custom one is specified.
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As for the plugin, I would like to know if its possible for multiple lines in the 'Downloads finished' window to be copied in one go when highlighting more than one. As in: if I click into the title field of a story and then highlight a couple and copy, if all the titles could be copied at once.