Climbing is activated when the jump/climb key is held or double tapped. Double tap causes problems when trying to jump on to and then jump off of a rock or other obstacle.
If I tap once and land on top of a rock, then quickly tap the jump/climb key again to jump off or on to another obstacle, I end up in climbing mode instead of jumping. It’s very frustrating when that happens while being chased.
It would also be nice if we could bind climb and release to the same key.