unix socket creation upon SIGUSR2

php-fpm seems to be missing a feature that could be really useful in a
shared hosting environment like the one I'm currently setting up.

When dynamically creating pools for new domains, the corresponding unix
socket isn't being created after having issued a SIGUSR2. It seems that
currently it is impossible to gracefully create a communication socket
on-the-fly, which means that php-fpm would have to be stopped/restarted.
This isn't very handy, for obvious reasons.

Any insights into a graceful solution to this problem would be most
appreciated!