Rescan for missing Posters?

[moreawesomethanyou]

Is there an easy way to tell Mezzmo to rescan all movies that have no poster/artwork? I look through my library, and many do not have any.
I know the posters are out there, because if I open Properties and use "Get Internet Artwork" it always has multiple results to pick from.

I know I can Right click on a list, and use Maintain playlist, but if I leave it set to "Only update Files with empty Attributes" the missing artwork remains empty.
If I check the "Update all Attributes" it will update every file, this usually seems to get the artwork, but has to rescan every file again as well?

Edit: Also, I've been using Maintain playlist a lot, and re-scanning large chunks of files, and find that sometimes, Instead of grabbing a poster from the internet
(that i can still get manually with properties) it's filled some movies in with a screengrab from the film, at least they aren't showing as a blank graphic I guess.