I'd like to second this. You just can't ignore the multiplayer aspect of Minecraft. It's huge. Imagine if you put all the young developers on the same server and gave them access to this. They could write scripts to coordinate builds and cooperate with one another. You would need to make some adjustments to it though. You can't just place blocks without the player being in range. It would need an entire toolset to move the player. Imagine writing a script to harvest and replant a field of wheat. Or maybe a script to navigate a cave safely, killing mobs as they appear. This would really open up a world of potential. Look into Bukkit.