Automatic tool selection based on selected blocks.

We all know and love the block picking button(MB3). But what if you added the option to automatically select the best tool for mining the block that you're selecting, maybe by pressing MB4 or any other button. It could switch to a sword or an axe when selecting an animal, and to buckets in water and lava. I've been thinking about this a lot and I would absolutely love to see this added into the actual game. Anyway, thanks for reading!