TreeCapitator addon significantly simplifies the process of timber harvesting in Minecraft PE. Break only the first log, and the whole tree will fall instantly. Just like that, you will be saving tool durability and time. Leaves now will be collapsing too, when you chop down the tree.
Now Veinminer has become part of the addon too. It allows mining the whole chunk of ore in one piece, similar to a treecapitator.
Enable All Experimental options in the world settings.