THANK YOU SO MUCH! This is exactly what we need for a dynamic duel with a friend. Will be much more pleasant to play some intense games on the map about the size of one continent in two when standard dueling size than half the night/day to be picked for one and quite possibly boring game. I'll try now to use it together with any mod at least partially removes polar ice and if it will - it will be just a fairy tale on the plains of tiny Pangaea =)
To address your feature request. I believe the exact spawning of players/civilizations is handled within actual map scripts. My tool does not address that issue as that would be a very specific 'map type script - like continents.lua or island_plates.lua' instead of a general use tool to add those scripts/map sizes.
Perhaps as I learn more about how the game works, i'll figure some fancy script generator algorithm but for now I believe it would have to be crafted specifically for your request and unfortunately I do not have plans to create scripts right now.