colorization of mode contents

[Haines Brown]

In LaTeX/PS mode, the \cite{key} command displays key values in green in
the raw .tex file. This makes it easy to spot the command in a block of
text.

Unfortunately, I'm using a cite command peculiar to the achicago style,
which is \citeNP{key}. Key values are no longer colored, but I would like
them to be. 

I get the impression highlighting of command is done with emacs' M-x
font-lock-mode RET. But AUCTeX apparently imposes its own scheme
activated by tex-font-setup. I don't know whether I need somehow to
configure AUCTeX or emacs. 

Since "citeNP" is unlikely to appear in other contexts, could I use a
setq statement in .emacs to highight it as a verbatim? Do I use the
LaTeX-verbatim-environments variable? I'm lost at this point.  

Haines Brown