Thank you for the advice, nowadays we(company where I work) use such scheme but that scheme is not always useful at the stage of development of the back-end infrastructure. Also we have found a better solution : have ldap for dynamic configuraion out of the box.
So question is following: if you got such task, where do you put ldap functionality inside postgres daemon?
PS I have read the basics of ideology Posgresql and I know why you guys make main server tiny in functionality and this is great, but we would like to have more complex solution.
This feature may be useful not only for me and my company.