well there is a "quick" ability already in game. I think it's quickstride for the archers. So there is no point in giving it to everyone. With the incoming addition of mounts (chocobo I guess) and other transportation, that would be even more pointless to give to all classes. I'd rather see it as a spell like the chocobo mazurka that some jobs could have to affect the whole group than giving everyone the possibility of having that spell.