Grimrock

You can climb up ladders by walking into them, or by clicking on them.

But what about climbing down ladders?
If you walk over a downward ladder (either facing the ladder or backwards), the party simply falls down until it hits the ground.

So if you have a ladder that is longer than 1 height level, you can't go down it without risking injuries.
Now, I don't remember if such ladders even exist in the game (which is which I've posted this in the Mod Creation forum).

My questions are:
1) Is there a way to climb down ladders, maybe a special hotkey?
2) If not, would it be possible to add this feature by modding the game?
IMHO walking over the ladder backwards is the "logical" way to implement this.

edit:
Climbing down a ladder might be a problem if there's a monster standing under it.
Would you push the monster onto another tile?
(what if there is no free tile to push the monster onto?)
(what if there are multiple free tiles, would one be chosen at random?)
Would you destroy the monster, even though you're not falling onto it?

Simply blocking the ladder wouldn't be a good option, unless there was a way to attack monsters from above.

I'm pretty sure there isn't a way in the normal game to climb down ladders. I hope it's added. I have an idea about scripting such a thing, but no time to work on it right now. This is an interesting problem and you've identified some real issues that would need to be addressed.