David,
Noted. Just to be sure you know of a shortcut. If an airport is in your flight plan, Simply Touch-Hold until your see the green dots, then release and you should see a " Extend Runways: 'xxx' " option in the list. There you will find an Extend All, and for each runway. Once Extended, if you go back there, you will have a "Hide Extended Rwys" option.
We have avoided an Auto-Extend All option simply to reduce screen clutter as many airports have several runways and the screen can become very cluttered.
It might be very feasible to auto-show for "Landing" airports. But I think that would be a user option, possibly in Map Settings. We'll take a deeper look at this again. Thanks for the feedback.