syntax highlighting docs

Hi, I'd like to thank you for AUCTeX, which I started using
recently after 15 years of using latex and emacs.

I use it for the syntax highlighting and the ability to compile
a tex document with two keystrokes.

I wanted to add some latex keywords of my own (which I use a lot)
to the syntax tables.  For instance, \fullref should behave like \ref
and \pageref

Per the documentation I tried M-x customize-group <RET> font-latex but
this said "no match"; later in the same session (after I edited a
latex file, perhaps?) I was able to run this command, but all attempts
at changing the variables failed with the message "Attempt to change
text outside editable field" (though I had the emacs cursor ("point")
right on top of the [Show] ).

After several futile attempts at finding and setting variables
directly (which had no effect) I finally grepped for "pageref" in the
AUCTeX .el files, and hacked the font-latex.el.  This works, but is
not an elegant solution and I can't do it at my job, only at home.

Do you have any idea what may be going on with the customize-group
screens?

Many thanks,

Silvio Levy
[email protected]