Package View Separator Line

I'm really liking the package view. Eclipse does not have this kind of view and it's really useful. I do agree with others that it would be nice to be able to filter the package view to only see the packages in the test tree or the source tree. But seeing them together is a great feature. I do wish it was a little more organized though. Maybe the source and test trees in a package could be listed one above the other with a little separator line? Like:

codec.huffman

    ------ src tree -----

    HuffmanCodec

    ------ test tree -----

    HuffmanCodecTest

    character-frequencies.properties

Unless there's already a way to achieve something like this, what do people think?

     Jon