Выкрутился следующим способом.
location = /index.php {
if ( $is_args != "?" ) {
rewrite ^/index.php$ http://адрес/ permanent;
}
root /home/services/www;
fastcgi_pass phpfcgi;
fastcgi_param SCRIPT_FILENAME
/home/services/www/index.php;
include fastcgi_params;
}
Posted at Nginx Forum: http://forum.nginx.org/read.php?21,188841,193729#msg-193729