At 04:40 a -0400 07/29/2009, J. Stewart didst inscribe upon an 
electronic papyrus:

><http://developer.apple.com/technotes/tn2002/tn2065.html>
>
>Specifically see the question labeled -
>
>"Q: How do I get administrator privileges for a command?"

Oooh...

   "Unless you are doing system-level development, you should never need
    to change anything in /System ‹ changing /Library should suffice."

So /Library doesn't require admin privs for any user at all, whether 
shell script or Finder? If that's the case, then I'm all set. :D