gconftool-2 -R /
the path can be such as /, /desktop, etc.
Disable Gnome Automounting
Under System->Users and Groups
then select your user, Advanced Settings (authenticate su)
then tab User Privileges, Access external storage devices automatically <check box>
might be the place to kill it. I'm happy for now, but will try later.
It then may be on a per user basis.