Yea definitely, but you'd have to whitelist the mac for each wireless device the router serves, not just attwifi. I live close to an elementary school, so I don't mind 3DS kids connecting as long as they use less than 3mbps or so of my bandwidth
I feel like school, back when I was actually in school, was more entertaining though, because of how much I get to interact with people, hang out with friends, and other stuff like that. All I get to talk to at work is my boring coworkers lol