First off, you are going to need to go to 6.1.x.x to get device fingerprinting.
Then you can force iOS devices into a specific Amigopod Captive Portal.
Basically the MDAC solution creates a TLS cert for each device. So, you will need to build an EAP-TLS encrypted SSID.
Sounds like Cam is working on something, according to this page: http://www.arubanetworks.com/blogs/new-aruba-application-notes/
Maybe Cam can give you an ETA for that document.