I just found this in the code for terra: -- Generate continental fractal layer and examine the largest landmass. Reject -- the result until the largest landmass occupies 58% or less of the total land. So we could probably increase the % needed for the largest landmass, but it would increase the time for map generation. Setting it very high might result in endless map generation (as no attempt would qualify). Then again, it's not a problem with the map script as far as I can see. It seems good as is, it even allows sailing from "atlantic" to "pacific" most of the time. And it definitively will place CS in the old world if there's enough space. All we need would be larger maps. 8 civs + 12 CS on a huge map comes close to perfection IMHO (judging from revealing the map on turn1, not actual playtime).