NS does support Channels 12-14, as well as the 802.11a channels. It is dependant on the card(s) used, not the application. (By the way, it's not covered in the README.)
In order to see those channels, you need a card capable of receiving and transmitting on those channels (i.e. FCC, ETSI, Japan, France, etc. Whatever the radio authority is for a given country.)
Stop the TSA now! Boycott the airlines.