unlang question

hi all, am looking at whether to migrate to 2.0 to create a couple of possibilities and was wondering if I can: 1. create a main vritual server 2. use unlang to parse the incoming requests and then based on whether they match a regex, proxy them to different virtual servers or to an external 3rd party RADIUS? I'm sure Ive missed something in the docs so pls any pointers verey gratefully received ! Andy