SET SESSION AUTHORIZATION superuser limitation.

Hackers,

There are feature which may be useful in conjunction with connection pools.
It is the ability to change the session user without creating the new
connection, like this:
(pseudo REPL):
notsuperuser > SELECT current_user, session_user;
notsuperuser notsuperuser
notsuperuser > SET SESSION AUTHORIZATION notsuperuser2 PASSWORD
'password_of_notsuperuser2';
SET SESSION AUTHORIZATION
notsuperuser2 > SELECT current_user, session_user;
notsuperuser2 notsuperuser2
notsuperuser2 > SET ROLE user3;
notsuperuser2 > SELECT current_user, session_user;
user3 notsuperuser2
According to [1], SET SESSION AUTHORIZATION can only be
used by superusers. Is it possible to extend it for use by not only
superusers?

[1]
http://www.postgresql.org/docs/9.4/static/sql-set-session-authorization.html

--
// Dmitry.