I didn't realize this had already been requested. Yes - this is an important feature and it should be part of the autofocus routine the same way it is there for mount slews. The focuser has no idea how long the overall system will take to settle - only the user and the orchestrating application can tell.
You want it to be as fast as possible - but for at least one of my cameras, the same focuser but a different camera just won't work with the autofocus routine due to smeared stars. It isn't just a matter of making sure the focuser has stopped - it's about letting the system settle - especially when near focus and the stars are very small - and sensitive to slight motion.
Frank