I have a project that uses spring-data-rest, and has a dependency project that only uses Spring Data. Both projects have spring data repositories and use @EnableJpaRep
Currently there's no global switch for what you're looking for. I've filed this ticket for you for inclusion in the next major release.
Not sure if it is an option for you but package private repository interfaces are not currently exposed unless explicitly annotated. If you can make all those library repositories package protected that might be favorable over the explicit annotation.