I'm used to IntelliJ automatically figuring out packages that I can import from for classes. I've noticed that in MPS, those packages are in "@java_stub" models. What I'm wondering is if there is a way to allow MPS to auto-complete from other modules that aren't yet added to the dependency (and then suggest adding them).
On a related note, is there any way to enable seeing the Java *source* from within MPS? I have the JDK source installed, and I like to be able to see the source code of libraries I'm using, to ensure that I understand what the intent of the methods/classes are.