This doesn't bode well for PMVC and multi-core, unfortunately. Without the ability to communicate through shared instances, and the app domain, the best you can do is use interfaces.
That's got nothing to do with PureMVC or MultiCore, it is merely a security limitation of AIR.
Seems like I should be able to fetch the modules as data, save them, then load them, though I haven't tried it yet.
-=Cliff>