We need something to distinguish lazy ship users, who barely never walk and
courageous hikers who are not afraid to walk every continent through just for
the sightseeing.

My proposal is next: How about adding some walking "reputation". You could get
hiking/walking muscles by training them.. Harder the terrain is, more you
would train them. maybe even better covering from -ep wouldn't hurt. The
difference wouldn't be too big because this is too easily abusable robottable
and even courages people to spam but some difference for the brave ones who
wonder without mounts or ships. Dunno if there is a good way to implement this
or not but had to let it out!