Sounds like a good idea, but I don't know of any automated cover art programs.
I had ~2000 movies (VOB files plus an RTF synopsis plus a cover image) stored in separate folders on 12 TB of disk space, and spent a good number of hours updating and correcting the thumbnails on the movie tab under the media files section on PowerDVD13. Then I made the mistake of "upgrading" to PowerDVD14, which promptly erased the entire PowerDVD13 installation folders including the cached movie database information files. Thanks for nothing Cyberlink! So then I started the tedious process of PDVD14 searching all my movie folders and rebuilding the movie file database. I was about halfway through when I quit for the evening, the next morning I booted up and launched PDVD14 and it had lost all the database information from the day before, although I had added all the location folders and they were still listed as such. Then PDVD14 got stuck on the "Preparing the media library" step and remained there for over an hour until I turned it off in disgust.
Contacted tech support and they told me to upgrade to the latest update, which I did, still same "Preparing.." screen. So I exited, uninstalled PDVD14 and then reinstalled it from scratch plus the update. That seemed to work so I started adding in all my movies once again, got halfway through and then started getting "Cyberlink media parser sandbox server has stopped working" error message popping up more and more frequently. I'd either click the Close program button or X out of the message. When PDVD14 finished I went back and checked - many movies were missing. Guess those were the ones where the sandbox server quit. So I closed out PDVD and rebooted, launched it again and now all my movie files are missing once again and PDVD is stuck on the "Preparing.." screen. I'm running Win7 Pro 64-bit on a 3770K Ivy Bridge system, 16GB memory, AMD 7970 video card, all latest drivers and Win updates incl. SP1, so I don't think the hardware or software is the problem.
I'll give PDVD14 one last shot with tech support, then I'm going to ask for a refund and go back to PDVD13. This alpha-level of quality is ridiculous..