I really don't see a reason *not* to implement such a simple feature whose pure intent is to reduce the stress put on hand muscles. It's not like it changes the gameplay in any way, despite what some say about cruise control or it removing the incentive of vehicles (it really doesn't; it's not like having autorun makes you get to places faster; just makes it less harsh on your finger), and the fact that many games with big worlds have this feature speaks for itself as far as it being a good QoL improvement.