If you have a big form to fill in, surely its going to take longer to type in the coordinates of each text box and get the mouse to click them rather than just hitting tab to select the next input element?
well, you should be able to, at the OS level use only keyboard shortcuts. Windows once was great with tab, enter, escape, but browsers make things more complicated than dialog boxes, and MacOS really isn't good at keyboard shortcuts. I would prefer the solution was not Mouseless and the others, but no mouse.