Zoom in and Zoom out with ALT

Would it be possible for a setting to auto Zoom in and out

I.E When at the Airport you it will already be zoomed in and when you start Descending it will start auto zooming in

I will vote for this, because when I get to final I always quickly zoom in on the map to maximum so that I can see the taxiways etc after touchdown.

Would be nice indeed if there was an option that would zoom in automatically when withing 1nm or whatever to the airport.