Love the idea of jumping command, However think it should be strictly bound to passive mode, can have a button to activate or even a emote execution like /Jump but will only activate when squared to an obvious small cliff. or a climb to vault a small or half wall type position. Example may be the small juts of earth that you can see sticking up on the way to say Skull Valley NW of LL. or even a 1 way jump from the large cliff where the crabs are located in the southern portion to Skull Valley. But should be activated by manual menu navigation (Like Synthesis, Aethlyte crystals etc.) or also a quick macro on a keyboard that would allow a player to be in position hit say B on the keyboard n activate the jump animation.
Development point of view that may cause adversity to this idea is it's ability to be abused as a kiting option versus monster or notorious monsters.

but DO NOT MAKE IT A WoW Jumping System... please. If you do this, don't add it at all. *Look i can jump~ I can Jump~ I CAAAANN JUMP~* don't want to see lalafell springing around town. Sorry guys.