I have a Cisco 2500 wireless controller and four lightweight access points. I want to use the controller to manage a wireless network secured by WPA only, without using RADIUS or anything else. We'll handle the authentication using a captive portal behind the access points.
However, it seems like the controller's default security policy requires a RADIUS server and I can't find out how to switch the policy off. The documentation assumes I'm in an environment which needs heavy-duty security and the use case is actually a small charity/business with much less stringent security requirements.

How do I disable the complicated security policy and instead run a simple one that just uses WPA?