I dont think that the character of Kalani would have been created as a pilot if that skill was not gonna come into play at some point right? Im not entirely familiar with how helicopters work but they do seem to be good for situations with little space to take off and land. Even if they wouldn't use it in order to evacuate the tower it would be nice to use for scouting and information gathering.

Also I would love to see the top of a zombies head get chopped off by the blade just like in the beginning of the original Dawn of the Dead... but thats just me.