When placing dirt should more be like when placing items, dumps dirt in front of character. This change can then be applied to digging cliffs that were impossible to remove than before, instead of defaulting to hug the cliff edge which essentially stops your character from moving with the keyboard, kinda annoying. You can climb to the top or edge of a cliff and dig then drop the dirt in front of your character one tile in front to the bottom of the cliff thus removing it. Many are in locations impossible to remove like on the water edge, lime pits, or any other type tile that creates these types of cliffs, of course dropping dirt into the water would still destroy it.
*Dirt drops in front of character
*Cliffs can be dug out
This would give flexibility