I think it may be related to http://feedback.arma3.com/view.php?id=10355

Well guys i have to bring you my apologies because i really didn't know that you recieve emails after my ticket's update. I also monitor some tickets and didn't get any mail notifications( well, maybe there were no updates about them). I just tried to keep this ticket visible pushing update button, because it makes the ticket to get on top of issues list. Otherwise how will people know about it's existence. But if it causes problems i won't use this method anymore i just want this feature implementation sooo much) Sorry once again

Yes i know about that. But it also allows to climb on some of the objects well at least in the area i've discribed before and it allows you to put line of sight a bit above the fence. Unfortunately when i tried to make a screenshot by Prt.sc key i got full black image instead of a picture(

Ironic or not but standing on that position make it a great observation point without being seen.

To my point of view this feature will expand the variety of tactical possibilities when commanding ai squad. Also as far as i remember in Arma 2 was some community made addon ( sorry don't remember the name )which provided something similar to that but not exactly.

"AI using simple mechanics like angling towards doorways with their gun up when they know an enemy is present, or crouching/standing with a lean towards the door instead of going prone would make the entire CQB experience much nicer"

Totally agree. Arma 3 has great cities with areas and buildings that just perfectly suit for great tactical firefights. But without ai's proper usage of buildings the gameplay becomes less fun and less tactical(