Being able to get over small ridges in certain outdoor areas is really the only major annoyance I'm aware of. It doesn't even have to be "jumping" so much as the character pulling themselves over the ridge, or something like that. However, given the height differences between races and the likelihood that these ridges were never designed to be "traversed" it could be difficult to come up with a consistently believable animation for all occasions.

For that reason, player-initiated jumping would probably work better than context-based.