With the new move to location ability you can tell them to go to a rock and if they have under half weight they will auto-harvest stone...i just have a couple on click to move them then i ride a beaver with few more beavers following him (its better to not have the beavers on click to move because they will get in the way) then most of the time im just moving stone from dodic to beaver...dont have to manually harvest...you can even put the beavers on wonder and follow and they will collect wood and thatch passively whole time...persknally i just take my highest attack beaver around after all the stone in area is gone instead of womder trick because most of the beavers are default attack