Alternatives for ManagedObjects (With ARS)

In an environment where we are already using the Manager and DirectReports attributes, we are trying to get automatic account linking up and running.

What are some good alternatives for the "managedObjects" field in the AD identity attributes?

We do have ARS, so as a secondary question; is it possible to use an ARS attribute in this way? Or is more configuration needed in order to use ARS attributes?