Hello Paul,
first: good suggestion, could you write this down somewhere in the wiki?
Perhaps at the discussion page of the Callbacks page?
> By the way, Patrick, would you mind if I rewrote your page so that it
> doesn't depend on LaTeX and uses callback.register instead of luatexbase? (I
> know it's a wiki, I'm not supposed to ask for permission, but I think that'd
> be quite rude.)
Of course. The reason why I chose LaTeX was the different to plain LuaTeX "add
to callback" mechanism of LuaLaTeX. I'll move that to another page ("Using
callbacks in LaTeX" or so).
Patrick