Sorry if it was covered before, but I've searched this thread both manually and by search, still without success.

So, in N900 version, where TAB is mapped? It's used to change height lvl of aiming (i.e. when You place Your merc on roof, and want to shoot off head of guy located in ground). Maybe it's something really obvious, but despite intensive research ( ) I can't find it. Which is big lack for me, cause I really like tactical element of placing "snipers" on roofs