I could see this as being a useful feature with a few caveats:
It should drain Hunger at an exceptional rate, equal to or greater than the cost to sprint. This should not apply to using Ladders to keep them useful. Perhaps you cannot climb at all when you don't have enough energy to sprint?
It should only work when you start off standing on a block.To prevent people from forever avoiding fall damage by dropping and then activating climbing at the last second. Or if you can do that you should still get the fall damage.
No using items when climbing a wall. Again, should not apply to using Ladders
Possibly require a specific item to climb like climbing claws?
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