Optional document class arguments in layout files

[Paul A. Rubin]

Hi all,

I'm trying to write a layout file for Operations Research (an INFORMS 
journal with rather, er, specific LaTeX requirements, and I'm stumped on 
the very first one.  INFORMS uses a generic class file and specifies 
which of their journals is the target (which affects various formatting 
things) via an option to the document class.  So I need the emitted 
LaTeX to say

  \documentclass[opre]{informs1}

at the top.  The only way I can see to pass the opre option in a layout 
file is to use something like

#  \DeclareLaTeXClass[informs1]{article (Oper. Res.)}
...
ClassOptions
...
        Other      opre
End

Only it does not work -- the LaTeX output contains

  \documentclass[11pt,oneside,english]{informs1}

which is sorely lacking the journal option (opre).  Is this the wrong 
way to specify an option to \documentclass, or am I erring in some 
visible way?

TIA,
Paul