Roster sharing: specifying specific LDAP groups to share to?

We’‘re using Wildfire Enterprise 3.1.1. LDAP groups seem to work fairly wonky on this setup (I can go in and find them manually, but browsing only returns the first one that LDAP returns). I’‘d like to be able to set up roster sharing so that (for example) our lab attendants can see our helpdesk users automatically, but I can’'t specify a specific LDAP group to share to. Is there another way to set up roster sharing that would allow me to type in the group name to share to?