mcMMO-Dev/mcMMO — pull request #2185 by Starryguy (2014-08-07 17:40:28+00:00)
Title: Added block metadata support for storing 'unnatural' blocks.

After seeing a player use an exploit on my server, I decided to create a fix for it. Blocks moved by stick pistions are not treat as 'unnatural' and still give experience and a chance for double drops and loot.

This adds a metadata value called unnatural and if set to any value when BlockCheck is called, returns straight away.