Upgrading Free Radius Proxy functionality

Hi All: I have to enhance free-radius for Wireless domain. For this purpose I need to include SSIS (Wireless domain)..... based proxying. This functionality is to be included in Free Radius used as proxy. SSID based forwarding takes precedence over realm and default forwarding. Please give comments or pointers about how to include this functionality to enhance forwarding and to change order. Best Regards -Gyanendra