For CA people wondering about DataPower.
It has a place for a "User Agent" that takes a server, username and password... or in SM terms: Server, Agent Name and Shared Secret
It then has something called "AAA Rules" which can outsource Authentication and/or Authorization to siteminder which takes a Host, Port and URI
I am trying to get screen shots of this unfillied out for my own records on the chance we get this working here. If i can, I will send the blank screen shots to this thread for SiteMinder folk to have some idea if they get questions in the future.
-Josh