You can make a suggestion by clicking on the Contact Us link at the bottom of the screen and sending feedback, however, this is in the same category as "make boxed sets worth the same number of credits as there are books".
The database that PBS uses doesn't have this data. Some audio book listings say abridged, some say abr. some say unabridged, most say nothing. You can't have a separate search field for something that's not on every listing and not in a standard format. The best you can do is what Shannon suggested, but this will only bring up the books that happen to have the exact word "unabridged" somewhere in their listing. It won't bring up the ones that have "unabr." or the ones that don't specify.
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