Not sure, but I would think Mac can hook into active directory since it's just another LDAP directory under the windows moniker.
This seems to make me believe it is automatic: 
http://training.apple.com/pdf/wp_integrating_active_directory_ml.pdf
FYI, I notice you mentioned having to change network security policy... There was a later IBM i patch (see below) that makes it so you don't have to lessen your windows / active directory security just to accomidate the IBM i.  (meaning you no longer have to use the old, broken DES_* algorithms which were deprecated years ago in later versions of Windows and active directory).
Fix            Release   Description
---------      ---------        ----------------------------
SI42919   V7R1        Adds AES & RC4 encryption support (krb)
SI42957   V6R1        " "
SI43034   V5R4        " "
SI43918   V7R1        Updates KRB5 header file in QSYSINC
SI43919   V6R1        " "
SI43920   V5R4        " "
-----Original Message-----
From: Justin Taylor [mailto:JUSTIN@xxxxxxxxxxxxx] 
Sent: Wednesday, December 10, 2014 2:59 PM
To: MIDRANGE-L (midrange-l@xxxxxxxxxxxx)
Subject: EIM & Mac
Has anyone actually set up IBM's Enterprise Identity Mapping (EIM) on Mac?  We've used EIM since about '08 but only on Windows.  For Win7, the setup is simple.  Just:
--Go into Local Security Policy => Security Options => Network security: Configure encryption types allowed for Kerberos --Check DES_CBC_CRC, DES_CBC_MD5, RC4_HMAC_MD5, AES128_HMAC_SHA1 & AES256_HMAC_SHA1 --Reboot & Presto!
But Mac?  I haven't a clue.
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