Ambushing and Sneaking settings?

[tos1]

The texts in [Q key]-[Game Concepts]-[Ambushing] and -[Sneaking], i.e. ip_ambush and ip_sneaking, says as below but I cannot find any related buttons or setting pages in the "Camp" menu (not only it but also in any menu I know).
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The ambushing skill allows you to set up ambushes.^ From the camp game menu, choose to set up an ambush. You will be told the current nature of your ambush, and if you are attacked, you will have the choice to launch the ambush.^ Ambushes can have devastating positive or negative effects.
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The sneaking skill allows you to sneak. From the camp game menu, choose to sneak. Sneaking will reduce your speed.^^However, if you are the attacker, you might have, according to you sneaking check, some combat bonus (but not as great as you would have for an ambush).
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I did a brief search for the words like "sneak" or "sneaking" from all text files of the MOD, but the found texts are only about "sneaking to a city" AFAIK. I don't know whether the "ambushing and sneaking in the fields" features are obsolete or are to be implemented. Also don't know whether the setting page appears only under some specific conditions. But currently there seems to be an inconsistency between the Concept text and the actual behavior unless any announce is done.

Sorry if I'm overlooking the implemented one.
Thanks