Magnificent. If you don't understand how can it work, let me show you an example (taken from my current project):
Imagine an Blizz-ABS game where 3 factions battle for the control of the island. It's an RMX-OS game, so faction members are real players. They can conquer towns and villages and defend them, also with NPC guards. Once they conquer a town, they can pay their money to develop it - build barracks, weapon shop and hire more guards (that one is by eventing, but you can feel the idea). This script will let you setup the option of adding new structures to current map and that's very useful.
Examples in non-RMX-OS game: paying for woodcutters to cut down trees, hiring masons to build a bridge, estabilishing a siege camp to destroy a wall, building a wall or fence - just imagine. Now you can add or remove any part of the map in-game without making clone maps (valley without bridge, valley with bridge, etc.).