While you can assign multiple actions to one key with hall effect, the biggest benefit (for gaming at least) is what they call rapid trigger actuation. The idea

While you can assign multiple actions to one key with hall effect, the biggest benefit (for gaming at least) is what they call rapid trigger actuation. The idea is that instead of the key triggering and releasing at a specific point in its travel, it reacts to a change in direction so you can instantly switch from pressed to released or vice versa at any point in the keys travel.