Add Country Filter to Spam Management Options

I deal with quote a few spam accounts, and I've noticed that the spammers on our forums are nearly always in the same timezone (UTC +5).

It would be great if there was an option in the spam management settings to filter registrations based on the users country (or timezone).
For example, if there are X warning flags, and user is in <country list>, to automatically reject the registration.

The users country would be based on their IP address, and not on any data they entered manually.