If we were using an SSH-type model, there's no particular reason why APs which you control which share an SSID can't also share a private key. If you are the ad

If we were using an SSH-type model, there's no particular reason why APs which you control which share an SSID can't also share a private key. If you are the administrator of the APs and you want them all to be seen as the same network, you could just move the appropriate keys onto the appropriate routers. Running multiple networks is the same thing - generate one key per SSID and duplicate them across all APs. According to the other comments, apparently something like this is already a feature in WPA2, so evidently it doesn't break down too much.