Use SSH key authentification with custom user home

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http://unix.stackexchange.com – I have some users which have different $HOME directories than /home/... The user homes are under /pkg/home and /pkg owner is a different user but all users have group access to /pkg. But it seems SSHD will restrict access to authorized_keys (e.g. /pkg/home/usera/.sshd/authorized_keys) because the user is not owner of the full path. Is there any option for sshd_config to change this restriction? Thanks! (HowTos)