[news.eclipse.tools] How do I override a Java Nature preferences ?

["Asaf" <asafr@xxxxxxxxxxxx>]

Hi, I created plugin-project with:

<extension id="javanature" name="My Project Nature" .resources.natures">
    <runtime>
        <run class="org.eclipse.jdt.internal.core.JavaProject">
    </run>
  </runtime>
</extension>

And I also override the "New" wizard for that plugin so I create my-self new
project.
When I tried to edit the preference of new project I created with the new
plugin, I can't see the java preferences such as:

"Java Build Path", "Compiler" .. etc.
What is wrong ?

Another thing: suppose I get from any of you answer, how can I add my own
entries into it, such that I have Java preferences + my preferences in same
project preferences dialog.
Another thing, how can I define my workspace preferences from any kind ?

Many thanks,

Asaf.