RE: SSID based authentication

If I want an enduser to be able to connect to the same SSID on multiple AP´s then I can not use "Called-Station-ID" since it also includes information about the mac address for a specific AP. So how do I do to be able to authenticate by just using the SSID and not the mac address for a specific AP?

Check your AP documentation to see if it can send an attribute containing the SSID. On the Cisco AP's that we use, it is sent in "Cisco-AVPair".