[pdftex] ExtGState and color

[pawcoo]

Hello,

I want to set some graphic state parameters for the whole document using 
generic pdfTeX definitions. Of course \pdfliteral{<gs params>} works for 
current page only since the graphic state is reset for each page of the 
document. So I've defined ExtGState dictionary:

\immediate\pdfobj{%
<<
  /Type /ExtGState
  /LW 15	
  /LC 1
  /OP true
  /OPM 1
 >>
}

\edef\pageresources{%
  \global\pdfpageresources{%
   /ExtGState << /myGS \the\pdflastobj\space 0 R >>
  }%
}

\pageresources

\pdfliteral{%
  /myGS gs
  .1 .2 .3 .4 k
  0 0 0 1 K
  0 0 100 -100 re
  0 0 m
  100 -100 l S
  ...
}

It works fine (shape of strokes and overprint) but what about current 
color? There are parameters which set a colorspace but I haven't found 
ExtGState parameter which describes current color. Is there any?

In the example above, to invoke defined ExtGState parameters I have to 
use \pdfliteral anyway. It means that to set a graphic state for the 
whole document I need to repeat \pdfliteral{/myGS gs ...} for each page 
in the output routine. Is there any other way to set global graphic 
state parameters for the whole document including current color?

Thanks for any hints!

Pawel