Again, IF they add jumping then it should be entirely situational. I.e high ledge that our characters should be able to reach if they jump, allow the player to jump then and grab the ledge. (Think FFXIV-2). Characters should also be able to swim above water in pools and such. And underneath in certain areas. (Could be part of the Leviathan fight).

But, also allow free jumping that only lets characters lift of the ground a few inches. While running, the character should be able to jump forward.

PS. So that Lalas don't look too ridiculous doing this, let them propell themselves upward by jumping off the wall of the ledge.
(Ie Lala climbs a but then jumps higher and grabs ledge).