The control of the hydraulics of the shovel fit inside the mouth and have force feedback: you will be able to feel if the shovel runs into rock.
I like the idea of biting into a mountain.
+ I've often thought that it would be fun to operate a back hoe type digger with a glove, etc, that translates movement of the joints of the arm.
I like this idea, but having observed the deftness with which some folks operate even huge earth moving equipment, I don't think it would yield much improvement in operability. A good operator does feel the varying composition of the ground as they're digging.
i saw something like this on battlebots ( some of the best technology has to offer to destroy itself ) this guy had a wire cage type thing on his arm to move the weapon . you could also hook the mouth mover thing up to taste buds and have different flavors represent different rock compositions , cherry for soil , strawberry for bedrock and fudge for a busted sewer pipe , i dont know if this would help the building process but it'd be cool.
I like this idea. It could be extended to controlling a paintbrush with your tongue. Licking in all those hard-to reach corners.
Nice. You would have to have some kind of neck support though.