>As for applications though, if the keypress could be made into an analog output, the keys could act similarly to shoulder buttons on game controllers or allow

>As for applications though, if the keypress could be made into an analog output, the keys could act similarly to shoulder buttons on game controllers or allow WASD/arrow keys to act similarly to a joystick. This isn't an "if" they are used exactly for that purpose already. What they can also do is change the length you need to press down to register an input, so you have a keyboard with variable sensitivity.