Like the things on tripods and construction levels. put one oni the body of the camera and have the should-pad adjustable like the head of a tripod so you can level it on an operators shoulder for maximum comfort etc...
I think this is an excellent idea. One problem that I have with the leveling blobs on tipods is that there is an additional swivel or two ABOVE the blob, so you don't really know if the camera is level or not; you know only that the legs are level or something like that.
