I tried something similar myself, but with no luck.
I Figured I would give your suggestion a try, so..
Made the following files:
/etc/e-smith/templates-custom/etc/httpd/conf/httpd.conf/86PhpsysinfoAlias (with the code you provided)
/etc/e-smith/templates-custom/etc/httpd/conf/VirtualHosts/30PhpsysinfoAlias (blank)
Expanded the templates for httpd.conf with expand-template
expand-template /etc/httpd/conf/httpd.conf
and restarted the httpd
/etc/init.d/httpd-e-smith restart
Did I get you right?
I somehow messed it up, as it wouldn't respond on any of the machines domains and IP's. Logs shows a clean restart of the service and there are no complaints whatsoever
note to self: play around with a less trimmed 30PhpsysinfoAlias