Question regarding rlm_perl and Access-Challenge

Hi, I want to develop some test cases for a radius client I am developing and I would like to be able to use rlm_perl to simulate various scenarios. The one I am having major problems with is Access-Challenge. I really like rlm_perl and the flexibility it provides and I would like to be able to specify the reply type. I've looked through documentation and the rlm_perl code for any hints on how to do this and at this stage I'm thinking I'll have to create a new interface to allow my perl script to specify the correct reply type to rlm_perl. Do any of you know of an existing way to do this? -- Harry J Walsh