One use case I immediately thought for hand movement tracking like this is to help my disabled brother - tetraplegic - steer efficiently. Using mouse for him is

One use case I immediately thought for hand movement tracking like this is to help my disabled brother - tetraplegic - steer efficiently. Using mouse for him is sometimes too hard. Only in some cases. If one could use this as a macro launcher or more accurate joystick without attaching real joystick, this could help a lot