I would not like to see guns carried by Crew. As already pointed out, 1) there is the risk that you don't hit what you're supposedly firing at, esp when ill-experienced and under extreme pressure, and 2) you're giving any potential hijacker another weapon at his disposal. I don't know what the answer is, although a more secure door sounds like a good place to start, and some very hard and fast procedures about contact with the FD. Interesting times.