[h4kunamata]

It is already implemented and it works like a charm.

I have been using it to explore trails and 4WD tracks, just enabled it on the map at the top left corner.

You will see Outdoors which enables the trails/4WD tracks, Contour Lines and Subway.

[pastk]

Display of marked hiking/cycling routes is a different feature from display of trails and tracks. I.e. a marked route is usually a well-known and/or official one and often quite long (sometimes international even) route which goes through many different trails and tracks and even some roads etc.

And - as it had been mentioned above already - its coming to CoMaps too.