It would be great to have something like this that could obviously be disallowed from pvp but something similar to abilities some of the classes in WoW (I know, I know but when they are your biggest competitor you should expect comparisons).
My meaning is thus, in WoW certain classes (which in GW2’s philosphy would be all professions for fairness) could do small flavorful or down right fun things like walk on water or feather fall. something like this would be fun I think.