bcrawfo2,
there are per SSID bandwidth limits - go to "Network", <any ssid> and select the "Options" tab. This, however, applies "per client", or "session" and not system wide for all users of a given SSID.
Is a system wide bandwidth limit for a given SSID what you wish for? If so, you could implement this by applying VLAN tagging on a SSID and use some sort of traffic shaping on the firewall or router....