I run a dedicated server (CentOS, CPanel, etc.) and have other hosted accounts. This is what my tech guys said after I contacted them about possibly making changes to the httpd.conf:
We seriously suspect that the changes can cause troubles for other accounts on the server. Changing apache's ServerRoot and PidFile is highly unrecommended. Cpanel will not be able to locate the correct pid files as it doesn't know about /var/run/apache-perl.pid.
So do I need to put LiveJournal on its own box?