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First of all you would have to have a way to figure out where they were at. Currently the ONLY way to do this is with their IP addresses. Or by their own admission.
You CAN ban by IP address but realistically trying to ban someone in this manner is easy to get around.
Is there a particular reason why you want to ban people from certain areas?
I will tell you, this will be hard to enforce no matter what you do. If you ban people by age for instance, all they have to do is enter a different age and they are no longer banned.
Is there a reason why you want to ban these people specifically?
Rodney
Attending College working towards Bachelors in Software Engineering and Network Security.