This is what they did at Marywood University.  They added a role of reference librarian to a few Moodle courses and then had one of the reference librarians subscribe to a research forum where they were able to answer questions and provide resources to students on the fly.  Since they were a part of the Moodle course they could see all the course information and follow the syllabus so as to know what the students were doing when.  One of the findings of the study though was that the project was extremely time intensive for the librarian and might be difficult to scale to more than just a few academic programs.  Might be worth trying a pilot of our own, especially since it gives the librarians the ability to interact with students in Moodle which many of them are becoming increasingly dependant on for program interaction.