For Windows 7 :
To kill saved settings for all users under windows seven clear the contents of the folder c:\ProgramData\Microsoft\Wlansvc\Profiles\Interfaces. This can be achieved with a group policy folder preference.
To allow Windows 7 users to save wireless settings under their own profile publish the key
HKLM\System\CurrentControlSet\service\WLANSVC\Parameters\WlanAPIPermissions\Add New All User Profiles. I exported a copy of this key from a laptop with the desired settings and pushed it back out.
In my case this was a string containing the value
This value could probably be tweaked manually to totally stop the use of system stored locations but I didn't bother taking it that far.