Functionality that I think would be helpful is a method to overlay a previously
textured object with
a new texture.  Perhaps this could be specified with an "overlay" keyword, such as
this:

object {
  o_PreviouslyTexturedObject
  texture {
    pigment { p_PartiallyClearPigment }
    overlay
  }
}

This simplistic example does not demonstrate how helpful this functionality would be. 
A better
example is a recent scene that I was working on in which I was building a brick road. 
I defined a
section of road as a union of 36x100 randomly textured bricks.  I then placed the
sections
end-to-end to form the complete road.  I wanted to have lines on the road too, but
wanted some
waviness to the lines for more realism.  Overlaying a texture on the entire road would
be the
simplest method, providing there was a method to do so.

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