Puxe suas sub-rotinas do Diretório para fora de seus contêineres do VirtualHost e ele deve fazer o que quiser.
<VirtualHost *:80>
ServerName domain.com
ErrorLog logs/domain.com-error_log
CustomLog logs/domain.com-access_log common
DocumentRoot "/var/www/srs/web"
DirectoryIndex index.php
Alias /sf /usr/share/pear/data/symfony/web/sf
</VirtualHost>
<VirtualHost *:80>
ServerName domain2.com
ErrorLog logs/domain2.com-error_log
CustomLog logs/domain2.com-access_log common
DocumentRoot "/var/www/srs/web"
DirectoryIndex index.php
Alias /sf /usr/share/pear/data/symfony/web/sf
</VirtualHost>
<Directory "/usr/share/pear/data/symfony/web/sf">
AllowOverride All
Allow from All
</Directory>
<Directory "/var/www/srs/web">
AllowOverride All
Allow from All
</Directory>