It seems like a good idea, but I am not sure that steam is the best place for it. It seems it would be better for a large company, so they could physically control admin privileges to their networks and software. It would create an extra layer of security that most companies would love. The same would go for schools and libraries as well.
Personally, I would prefer an external key or authenticator over this, due to the problems of hardware changes and component failure. Although it is strange that games have more security measures protecting them than online banking...
Personally, I would prefer an external key or authenticator over this, due to the problems of hardware changes and component failure. Although it is strange that games have more security measures protecting them than online banking...