Now you can mine an entire grain of ore just by mining one block of ore, you can also chop down a tree by cutting down just one block of wood. You just have to sneak by pressing the shift key or whatever key you have set to sneak. By default the left shift. This addon is also survival friendly.
You can mine ore, chop down trees and even farm. All you have to do is sneak.
But if you have to mine a piece, just mine it normally(don't sneak), without sneaking.
So if you're still reading; You may want to know what you can do in this add-on. Well, here's a complete list of all the features for you

DISCLAIMER: This is an unofficial app for Minecraft Pocket Edition. This app is in no way associated with Mojang AB. The Minecraft Name, Minecraft Mark and Minecraft Assets are property of Mojang AB or their respectful owner. All rights reserved. According to http://account.mojang.com/documents/brand_guidelines