Are you making new map blocks, or fixing old ones?
No just playing around with the Mapscript, to alter block distribution. Like URBAN has now 4 possible combination of occurancy rates for 20x20 map blocks, which each are equally possible, same goes for the roads.
So you can have a standard vanilla Terrorsite in Urban, or you can have a maze of a few 3 level Appartment buildings.
Nothing is fixed, map is still generated randomly, but on certain scenarios some blocks occur more often.
Like EXPANDED_TERROR has a possibility to spawn up to 4 of these 4 level Appartment blocks, which are a nightmare, if you do not blow them to bits.
A further goal is to make scripts to regulate 20x20 block occurance rate for UFO missions, based on mapsize, smaller maps get less 20x20 blocks, larger ones more at least thats the idea.