Extension of facet_grid or facet_wrap ?

[Ed]

Hi @all,

I especially want to adress the developers of ggplot2 around Hadley.
With the help of facet_grid or facet_wrap it is possible to create
diagrams with 3 variables.
Do you think in the near future it is possible to create a diagram
with 4 or even 5 variables with
the help of a facet_grid or facet_wrap meta-concept ? One could
achieve that with semi-transparent colors for example.

Just a thought :-)

Have a nice day,

Ed