This is on my wish list for a long time. Can Garmin make the D fly wireless buttons on the Shimano Di2 system configurable for zooming in and out on the Garmin map when riding? Wahoo already has this. Now I use the D fly buttons for flipping through the screens and to start / stop a ride. That's nice, but I notice that zooming in and out during a ride is something I do often. It's a bit of a hassle to do that with your fingers on the screen (pressing the + and -), and with winter gloves almost impossible.
Hope Garmin can add this in a next software update.