I'm unsure about 'password' but if you mean encryption key then I don't know but I pulled icfg-wlan0 together by setting it up in system-config-network and then binding it to br0. So fooling around there might be a place to start. Will give it a try tonight.
You might also want to consider routing because you can then firewall & or discriminate services by subnet. Basically you'd be acknowledging that your wireless isn't completely trustworthy and adding a layer of security.