When setting up Openfire to use LDAP as a user provider, one or more LDAP users can be marked as admins of Openfire.
Similarly, it should be possible to mark (every member of) a LDAP group as an Openfire admin.
In Openfire 4.5.0, the setup wizard will now prompt for either a LDAP group or individual LDAP users when defining Openfire admins.