TomatoUSB

I've searched on google and haven't found a way to do this. I've updated to the latest Shibby FW on my Asus router. I use the wireless mac filter to restrict who can get on my wifi network. I've just setup a guest network with WPA2 with the idea that I won't need to put the mac address into my filter for each guest. However, I found that the mac filter applies to all SSIDs and I can't pick which SSIDs I want the filter to apply on.

Is there a way to do this? If not, can this be added in? Kind of defeats the ability to have multiple SSIDs if you can't apply different security settings to them. Thanks.