Why isnt' this built in? User IP at registration?

[Jolten]

With vb3.0.3 it's possible for a user to register multiple accounts using multiple email addresses but all from the same IP. In addition a users IP isnt' even stored until they've posted. So someone can sign up for aacount after account after account from the same IP (provided the email's used are differnt) and if they never post, they have a great chance of getting away with it. I don't know why the IP isn't grabbed at registration or why there is no option to disallow multiple accounts from the same IP.

I really need a way to disallow multiple registrations from the same IP.

Please, please, please someone consider making this tiny hack.

Thanks.