(1) Outside of villages, they can clear terrain and dig holes, but they can't dismantle roads. It would be nice if they could, especially given that if you want to dig a hole where there's already a path, you have to dismantle the road first.
(2) It would be nice if they would just do whatever it takes to accomplish what you ask them to do. For example, today, if you want to dig a hole on a tile with a path, "Dig Hole" does nothing. You have to "Dismantle Road", wait for it to finish, then dig hole. And if it has not just a path but also, say, crystals, "Dismantle Road" does nothing. So you have to "Clear Terrain", wait, "Dismantle Road", wait, "Dig Hole". It would be nice to be able to just "Dig Hole", and if that means they have to clear terrain and/or dismantle road, fine, they do that first, without being explicitly told to do so.