LandClaiming was developed for ZW_15 to work as a world protection plugin. With this plugin, players can claim any land, with any size or shape as long is it does not go over the max amount of claimed blocks (which is configurable).
Github:
https://github.com/ZombieStriker/LandClaiming
The amount of land a player can claim is determined by their group and the amount specified in the config.
1.1: