Why would you like mounts in a game in which you can cross the maps in 3 real time minutes ? Lol
Err, not so much as an increased speed thing. More it would be fun to play like a goblin riding a warg into battle, or like he said, a halfling riding a donkey into a fight. There are some subclasses somewhat based around the concept I think, and it'd be more a combat thing than a map exploration tool.