[otrs] OTRS Authentication against Samba 4 AD implementation?

Now that Samba 4 implements Active Directory protocols to the point of being able to implement full AD function without any Windows servers or licenses, has anyone done any work with getting OTRS to authenticate against a Samba 4 AD domain? I'm looking into it here, but if someone's already done it, I'd like to exchange notes about how you did it. (this is a big deal, because it effectively makes doing effective Kerberos and LDAP authentication for OTRS a LOT easier, especially since the Samba 4 servers can be directly integrated into an existing AD domain and managed with the Windows AD tools. The licensing implications of having a fully open-source implementation of AD without per-client license requirements is a Really Big Deal).