Display Customer Activation status in 'Custom List' and enable mass delete of Spam Customers.

I would like to see whether a customer has activated their account or not in the 'Customer List'. This would enable me to delete customers which were created via. spam emails quickly. 

Better still would be an option to delete all customers who have not activated after say 14 days.

The ability to Delete a Customer when viewing their details would also be welcome addition.

Thanks,
Neville