I would find a simple political map mode very useful.
I'm sure you already know what this means, but for
clarity - I mean that instead of the blue marble images
the outlines of countries would be shown (if enabled)
and filled with a solid colour as can be seen in this
To just do this for countries would require no further
data than is already included in WW as I see it - you
already know where country boundaries are.
Another way of implementing this could be to apply the
colour fill as an alpha channel to the blue marble
image so that the countries are tinged with their given
colour rather than being a solid colour.