Sometimes you really want to scan all objects, or in the words of gary oldman from the professional, "bring me EVERYONE" :-) There are a couple of different reasons for that from an org perspective, given current feature sets, most of it involves catching up on s3 security from both an acl and encryption perspective after the fact.
Salactus provides for scale out scanning of every s3 object with configurable object visitors. It also supports s3 inventory as a