at least in terms of being able to do so over structures say waist-high at the most. like a low fence, etc. I'm not in good shape and even I can pull that off. Not sure how/if it would even work with the way the game is built/characters are animated. I guess it would mostly depend on how much work it would take to implement.
I would just like to re-enforce the need for this... it would make for quick escapes over obstacles and maybe if your carrying too much your unable to vault/mantle obstacles or a chance of failing/falling