The idea is simple: the user selects which biomes and features they want in their world, and the mod generates it.
The ideal map generator would thus likely consist of a back-bone terrain generation code that can take certain parameters from plugin-based biomes and terrain features to generate the world. It handels the generation and transitions between biomes, taking what it needs from the plugins.
Other modders on the forum would tweak the biome specs to whatever they wish, to produce earth-porn like biomes and features. The biomes and features can then be added to the mod folder, the biomes appear in the drop list and the user picks which biomes they want added.
An example: the user finds a Caribbean Island Biome plugin (new tree shapes, strings of island for example) on the forum, and an Ancient Ruin Feature plugin (randomly placed surface ruins with chests and spawners etc.). He then adds them to the mod, loads a new map, done, tropical islands with ruins everywhere! :smile.gif: