Block placer and Block breaker

After the announcement of the crafter, was solved one of the biggest lacks of automation in vanilla Minecraft. I think there is more things that could be improved by new features, but one that is indeed among these lacks is the ability to automatically place and break blocks.

If I was to suggest, things that are able to be used, like wheat on cows, following the example of shears on sheep, should stay on the dispenser.

New and old things that are placed, like blocks, saplings and, for instance, the water bucket, should be moved to this new block. One block "uses", while the other "places".

About the breaker block, it should require some kind of fuel, as players consume the hunger bar to break blocks. Maybe arrange the recipe based on a furnace.

I know it is a difficult arrangement, since we already have the dispenser that takes some of this functions. I hope you ponder about this. It would be an amazing feature.