But then comes the issue of having the out of breath moodle from sprinting, and thus not being able to jog because you are already exhausted from sprinting as long as you can. I wouldn't mind a system where you tap the key to change the mode of movement, where walk is default to always on, and the switch key switches from jog to sprint or sprint to jog, and then you hold the shift key to do whatever is switched on. The key should be something near the wasd though to keep things easy for people.