Locations blacklists

Would it be possible to implement a locations blacklist in GLPI just like it's already implemented for IP, MAC, Serial Numbers, UUID and Emails ?

This would be really useful for us because when we import users from our Active Directory, some users have a location (roomNumber) that doesn't physically exist and we would like them to either have the location empty, or replaced by a default location.

Also when fusionInventory plugins does it's inventory, some printers, switches, etc reports a default location from their manufacturers and since they are not one of our locations, we don't want them added to glpi.

Would this be better implemented as a blacklist (glpi/front/blacklist.form.php) or as an import rule for users (glpi/front/ruleright.php) ?

The idea is that no matter what, the final result should be that invalid locations (locations that doesn't physically exist) should not end up being added to the locations list.

Thanks a lot

Francois