Well, you wanted to use ~/man/ for it and for root that would be /root/man/.

/tmp/man is absolutely no option, because of security reasons and because /tmp 
is autocleaned by default on every single (re)boot.

And ~/grml/man does not exist as well on every system as user with uid 1000 
must not be named 'grml'. And user root definitely should stay out of /home/
$USER.

Sorry, that's just too hackish for integration into a distribution. We have to 
find a much cleaner solution.