One thought after using the editor a bit: Would it make sense to hide the “These relationships have a specific ordering” checkbox on relationships that don’t actually have more than one value? In the common case of a single recording being linked to a single work this checkbox takes up space and the unconditional plural is a bit confusing.
Edit by @yvanzo: now tracked as [MBS-12967] Hide the ordering checkbox under lone relationships - MetaBrainz JIRA