What do you mean by "quota management" please?
Can you describe your intended wireless environment?
Do you mean for an office building with many little companies using their own SSIDs/VLANs,
or a Stadium or Hotel where you have thousands of unauthenticated clients, who may use
a Browser type access, over thousands of potential IP address subnet/VLANs, but need short
session timeouts, etc...
Have you met or talked to your local Reseller or Ruckus Systems Engineer, if you are thinking big?