Hi Maxim,
thanks for the reply. The use case that I have is when php-fpm is running as a user different than the nginx one. In this case the permissions being set as 0700 basically deny any manipulation of the cached files from php scripts. Everytime you try something like this you get permission denied.
A similar scenario and possible solution which unfortunately doesn't work is described in this thread.
https://github.com/rtCamp/nginx-helper/issues/63