AppCoronaDelegate in a native plugin

I would like to build a native plugin on iOS.
This plugin needs a specific AppCoronaDelegate class. I really would like not to build a specific App but use only the plugin mechanism, so it will be compatible with the Solar2d Emulator, and it will be easier to release it.

I posted A question on Corona Forum several month ago, and I received a response from Alan Thomson saying that it was probably possible to use a special instruction in the Metadata.

Actually I am not successful, and my specific CoronaDelegate is not called. Is there anybody who can help me and give me more informations to achive that ? Thank you.