I whipped that article into shape, so I'm glad it's helpful already. =)
I wanted to add that if you meant for these to be managed, that would eliminate the 'hidden' (root user crontab) daily scheduled job. Packages that are exported as managed do allow for installation as unmanaged.
How to convert an unmanaged SEP for Macintosh client to managed
http://www.symantec.com/docs/TECH131585
I also second the recommendation that once a month is not frequent enough. The definitions also detect Windows threats, so it keeps Macs from being 'carriers'.
For what it's worth, I don't notice any change in my machine when it's checking for updates. Also, if LiveUpdate is scheduled to run when no one is logged in, it will not be able to launch until that user is logged in (for user-specific schedules).
sandra