There are a few different mods that allow chopping down entire trees. However, this one gives configuration options for chopping the leaves and automatically putting them in the inventory. Paired with the bonemeal mod that can use the wood and leaves to create mulch to grow more trees, this is perfect for early game tree harvesting. It also changes the speed based on the tool used meaning better tools still have a purpose. Simple and effective! :D
Simple and gets the job done. Some potential questions answered: Yes, it will degrade your axe for each block mined; Yes, it has a range limit (it will stop mining if you go too far away); I think it only allows one at a time (but not sure I remember about that one).