That’s just not feasible in the time they have between elements.
The only way I could see something like that working would be if judges make notes on their paper about which bullet points and which errors they are applying, and then input them into a more complex computer screen after the program is over.
If they each come up with a shorthand that matches one mark per bullet or error, it's a lot quicker to write 3 or 4 marks right next to each other on a paper than to move the finger or pencil eraser or mouse to different parts of an input screen.