I think it would be handy to be able to remove a part file from Vault, when the part has been deleted from an assembly in Inventor. A good example: Working with Tube & Pipe or Frame Gen, you generate a new part file for each frame member or pipe spool, route etc. Check these into the Vault, and then in 2 weeks the design changes so you end up blowing parts away from the assemblies. What you end up with at the end of the project are a bunch of local files that did not get deleted when you checked in the finished product.... as well as a bunch of obsolete parts in Vault that are still checked out form when you were editing.
If you're like me you panic at the idea of blowing any of these away, even though you know logically that they are obsolete. It would be nice to at least get asked if we want them removed from Vault, at the time they are deleted in Inventor.