As it happens I have a lot of examples, and they're even written up, though not specifically as formal 'use cases'. You may recall that in 2007 DCMI collaborated with JSC on the building of the RDA Vocabularies. There was quite a bit of good stuff gathered as part of that activity, which is now on the wiki of the successor group, the DCMI Bibliographic Metadata Task Group (http://wiki.dublincore.org/index.php/Bibliographic_Metadata_Task_Group#
). At the bottom of that page is a like to the historical archives of the group.
The specific thing that I believe would help is a section called "Cataloger Scenarios":
There are ten scenarios, contributed by a variety of people, and they generated a fair amount of discussion, most of which is still available through the JISC archives for the list (which is the same list as the original group used). As I'm sure you remember, catalogers inspired to supply examples contribute the knottiest things they know about, based on their experiences with the materials they catalog. So you'll note that there are a lot of special format scenarios.
P.S. BTW, one of the best things about RDA is the relationships, all of which have URIs: