Programmatically adding a user to the System User role

We have been working on an application that will be using a forms-authenticated report server (RS2005) as a reporting back-end. Using the reporting services web service I have been able to assign permissions to objects in reporting services no problem. The issue is that each user needs to be added to the System User role to be able to use the report builder properly. I can't seem to find a way to do this programmatically. Any idea?Nevermind, GetSystemPolicies() is what I was looking for.