A button on the screen to fade out /fade in all of the tracks
When there is a track overlapping the road you can not see what kind of street/road/way/path this is. It is important to know, e.g. when I have got a track and I am searching for the small or unpaved roads with my motorbike. Now it is a little complicated to fade out the track just to have a look and then to show the track again. In my opinion that button would be a great feature.