I am not sure since when but we can now export Libraries of Modules to dependent Modules:
Go to the Order tab of the Module settings (yes I know not very intuitive see http://www.intellij.net/tracker/idea/viewSCR?publicId=33445)
Well in fact we can in the UI only. However I could not make it work. Whether I export Module, Project or Global libraries, I am still getting undefined exported classes ;-(
Since the feature request http://www.intellij.net/tracker/idea/viewSCR?publicId=21410 wasn't mark as complete nor scheduled for Pallada I am not sure it is just an incomplete feature that shows up too early in the last 2 eap builds (I could only test 2051)...
Please tell me it is true and you are going to provide Library export. I and the 11 other people that voted for this would be very happy.