Probably not in the forseeable future as the routing services we use don't have that capabiliity, but if that changes we can certainly consider it.
Admin.. Will this feature be added in later? So far this is the easiest most efficient mapping service I've used to create trails for a 4x4 offroading group..
Sorry, there isn't a way to do this.
Is there any way to only select gravel/unpaved or seasonal roads, or a mix there of?