I feel that a part of your problems is being addressed by Bug 83706:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=83706
You could simply add the libraries including their javadoc to your
project, and share it with the whole team using CVS.
To find the dependencies of e.g. jface you could use the Plug-In
Dependencies view of PDE, or look into META-INF/MANIFEST.MF of the jface
jar, key "Require-Bundle".