Well, the normal civ map is actually cylindrical, rather than spherical, because E-W distances do not shorten as you go north or south from the equator, and you can never actually get to the poles. And it's impossible to have a real donut in 3-dimensional-space that demonstrates the area-equal property of the "toroidal" civ map (donuts don't have poles, RLesink, btw). The best way to think of the toroidal map is simply that the world will wrap N-S as well as E-W.
Mad, Fantasy is a great choice for a toroidal map because the climatic justification for the normal map's distribution of jungles, deserts, temperate areas, and cold areas goes out the window with a torus (and indeed, it's pretty unlikely that gravity would create a toroidal planet).