I am half answering my own question here but I still need a little clarfication...
I see that I could add a second CustomLog entry like this to the vhosts file
LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-agent}i\"" common
CustomLog "/var/local/enhance/webserver_logs/filename.log" common
But how often would my manual edit be lost?
