When i plan some route, sometimes it crosses, for example, railway or some other short area, where are no road or track, but actually i can cross it.
For example, here (https://www.openstreetmap.org/#map=19/59.57343/30.36722) I know, that i can cross this railway. But there is no track, and graphopper builds round-out route, which is much longer. And there is a lot of such places in the world.
I think it would be useful to allow add offroad parts to the route.