Ok.
choose if go on "via ferrata" or not when make a route is also better
Thanks for the feedback. We'd need to add a new extra setting for this as most people wouldn't want to be routed on a via ferrata. We've added it to our feature requests list (number 125) where anyone interested in this can vote for it.
If a path is a "Via Ferrata" (highway=via_ferrata) the auto rute doesn't work