[Dovecot] Index File Permissions - Perhaps feature Request

[Marc Perkel]

Trying an experiment to put the index files on a different volume than 
the mailbox files The idea being that the mailbox files are in a limited 
space slow raid1 array and the index files are somewhere else that is 
fast and not backed up. I'm using a virtual file structure as follows:

/vhome/%d/home/%n

The index files are set to:

/nobackup/indexes/%d/%n

Upon startup it created the index files correctly making all the missing 
directories. But I have an issue with the permissions. The problem is 
that it works for the first user, but the second user will have a 
permission error on the /%d/ level because of the 700 permissions.

So - I would like to specify that directories that are automatically 
created have 770 permissions instead of 700, and, that perhaps I might 
want to ser the group permissions to 660 instead of 600.

This might make Dovecot more ready for shared mailboxes in the future.