You already have the option of creating the association yourself. There's an example in the thread you linked. (Or this one where the command will work outside of Opus as well.)
For most people, it's so unusual to need to import the whole configuration that it shouldn't matter how it's done. (If you are doing it that often, there's probably a better way, too. Depends why you're doing it.)
Don't really want to encourage people to use config backups as a way to share parts of their configs by making it even easier. That's enough of a problem as it is.