Request: Export depth maps with chunky's images

Not sure how hard this would be, but I would love you forever if you added the ability for chunky to export a luminance depth map with its rendered images.
This would add so many possibilities for compositing Chunky's images in a 3d compositing program such as After Effects or Nuke and adding stuff like particles and fog.

EDIT: I have no idea how to add 'feature request' tag to this..