Double the size of the map? Does the game code allow this? Performance?
Every day I learn something more about HOI. My best guess about doubling the map size, is that it shouldn't be too difficult. Of course I would need to test it and some a little bench marking but a 5-7 year old PC shouldn't have an issue. If someone is still running a Celeron CPU, IDE hard drive, 8 Gb RAM, yes they'll have an issue. The reason I want to double it is when one zooms in on smaller countries (i.e. Andorra, San Marino, etc.) and the islands. When we do the map update, 1.14, I would also like to add a few columns to the province.csv file (i.e. Max Port...maximum port size and Max Men, they already have Air Capacity (AirCapacity) column that isn't currently being used). I've been to Palmyra on my parent's sail boat and there isn't much room on that island.
South America has a lot of Temperate climates. Have you looked at Chile, Paraguay? It seems the Pacific side is Temperate but the Atlantic side is (except for the Falklands) is SubArtic or Artic. It appears the climates for many provinces need to be re-evalurated...Brazil is Mediterranean, even the provinces that are Jungle. Then Argentina is SubArtic...yes, for their southern provinces but for Buenos Aires and north, no way. It should be at least Temperate and even some northern provinces subtropical.
By adding that one column, Hemisphere, to the province.csv file, one could be a bit more accurate since the world axis is 23.5 degrees.
I also want to split out the histories and statistics since they drastically slow down the game in later game year play. I would create a .his file with the same save name file that the game would access only when a player accesses it (Statistics tab, expanding down on ships, etc.)