I'll reply with what Ben Rockwood gave me:
1) Simply stop the automounter! You can tell SMF to disable the automounter completely using 搒vcadm disable autofs? And, thankfully, unlike the old ?etc/init.d/autofs stop? when a service is disabled with SMF it will NOT restart when rebooted! Nice indeed.
2) The proper way is to edit the master automounter map file (/etc/auto_master) and comment out the entry for /home. Once that line is commented out (using a #) you can just restart the automounter (svcadm restart autofs) and your good to go. Test it by touching a file in /home.