Javadoc eclipse plugins

I have to do a big Composite Application and have to write many eclipse components. One big problem is that if i set the target platform to the Lotus notes install i have no javadoc help for eclipse classes and public apis of Expeditor and Notes available in eclipse. This is really very annoying if you are used to the excelent help when you develop against the plain eclipse rcp target. I have found some entry in the Expeditor wiki that it is possible to install Expeditor Developer utilities to get the javadoc. But what is the same help for the Notes developer, because i am not entitled to download the Expeditor client. Is there a developer utility for the Notes client 8.5.1? Or is there another trick to get the javadoc in the Lotus Notes target platform. I have tried to overwrite the eclipse parts of Notes with the parts from a eclipse rcp, but this makes some wired problems in my notes install. Any help is very much appreciated.

Ralf