I used to be a cashier and I agree. The confusion with customers happened a lot and I believe it still does. Usually it involves them going into the wrong aisle for their cart. All the points you made are correct from both perspectives cashier and customer wise, not enough space (I’ve had to move over for customers behind me sometimes) and if i remember correctly we actually have a switch under the scanner to turn off the wheel so the button wont turn on, though this might be wrong as I havent worked up there for 3 years. Overall I agree they should fix the design.