Correct me if I'm wrong, but I think you are under the assumption that you cannot broadcast multiple SSID's from any single AP? You should be able to have both SSID's broadcasting from any AP. Then you can setup a schedule for the "Lunchtime" users SSID that they will connect to under the SSID Availability page in your dashboard. Under the Firewall & traffic shaping page for that same SSID, you can set individual client bandwidth limits, or a limit for the entire SSID per AP. I think that would be the way to go unless you want to setup some more in-depth Group Policies.
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