Its not like you can’t change the MAC address 
Boy did I have fun in NYC…cracking wep keys.
I would just set it up to use a wep key. basicly a password you need to connect to the network and it encrypts the traffic.
Edit: It just annoys me when kids on forums are like w00t I have an ultra secure wireless network its unhax0rable…because they turned on a few options there linksys comes with…same thing with business customers I talk with about their networks.