Sorry to say, but one of the major drawbacks of the Producer 8 over the cheaper Cinema 7 is that you can only learn to the dedicated learning buttons.
However, part of the reason this remote is so damn expensive is because you can send it in for free to have codes added.
There is another option available though. You could return that Producer 8 and add the Aiwa code to the Cinema 7 yourself by building a JP1 interface.
Details
[Link: hifi-remote.com]Rob.