I saw in some posts that people posted screenshots of their regions and I saw that their cities had biggest size possible! Whenever I create a new region it always has an assortment of big, medium and small, and I was wondering how I can choose what size I want. I want all my cities to be medium size.

There is a file in the region folder called config.bmp ( i think) if you edit it and you make squares of 4x4 pixels in blue (0 Red 0 Yellow 255 Blue) and you make all of them like this, you get all cities maxium size