Import and run a Phonegap 3.0 project with Intellij IDEA 12/13?

Import and run a Phonegap 3.0 project with Intellij IDEA 12/13?

Just starting with Phonegap and having some trouble understanding the
directory structure and setup (on Windows).
I have been able to install and setup phonegap, jdk, android sdk, ant,
etc. Using the command line I can now create a new project, edit the
source files in www , build it and run it on my phone, Android Emulator
and even Genymotion .
But the one thing that I just can not seem to understand is how I could
edit and run the Phonegap project from within Intellij IDEA. All examples
and how-tos I can find use the older Phonegap 2.9 structure, which is
quite different from 3.0. I enabled and configured all plugins, etc. I
then try to import the existing project folder as a new project in IDEA,
but it says "Source files for your project not found".
But when I build the project first with phonegap build android using the
CLI, and then try to import it in IDEA, source files are found and I can
continue the import of the project. But the Project Structure then seems
to point to source files in platforms/android/assets (platforms/android
itself and also platforms/android/gen and platforms/android/src , I have
no idea what to choose, so I choose all). I then click Next a couple of
times until the Android project is created. After changing Project
Language Level to 5 (no idea what this means) , I can now run the project
from within IDEA.
But... changes that I make in www don't end up in the compiled project!
So do I have to copy all files manually to platforms/android/assets then ?
(the command line phonegap builder did not require this).
What do I need to do to achieve this in IDEA? Somehow I think some things
in Project Structure are wrong, but I have no idea what all this means
(Modules, Libraries, Facets....). Where should the manifest file be
located, and the resources, and assets and libs?!
Could anyone point me in the right direction?