It would be nice if computer administrators could enforce settings across all
users of a computer, enabling some form of managed deployment.
Mirroring the existing settings (at least, the ones that make sense for all
users) from HKEY_CURRENT_USER to HKEY_LOCAL_MACHINE would be a logical way to
do it. Putting settings in the HKLM\SOFTWARE\Policies tree and providing
Administrative Templates to manage the settings using Group Policy would be
above and beyond.
If would be even fancier if the presence of a managed setting cause the UI
for that setting to be disabled, grayed out, &c.