configure acls on remote machine

[Robin Becker]

I have a remote freebsd host with root access via ssh user login and su. I would 
like to configure acls for the /home mount, but am unsure if I can do this remotely.

Last time I tried to reboot the machine via su root it went dead for 24h while a 
  human was sent to press a button or something.

I see possible options as
1) switch to single user mode somehow and then unmount /home and configure acls 
with tunefs

2) su to root
    kill processes using /home
    do the umount and so on with /home unmounted.
    remount /home

3) some other method.


I imagine it might be quite hard to do 1 and 2 seems difficult unless I have an 
ssh to a home folder which isn't under /home.

Any ideas welcome.
-- 
Robin Becker