So it stood out to us that even if we handwave the ability to snipe in busy, high populated streets and such, finding your target and getting a beat on them long enough to hit them (which is a skill check, if you fail you can miss entirely or actually get a message that says you hit someone in the crowd and the difficulty scales on a population rating for the room)
Anyway, so we put automatic open/close doors on most Mix business to prevent people from being to stand rooms away and snipe into businesses and bars and such. You are better served waiting on the many nearby roof tops with the appropriate weapons designed for long range shooting or waiting for someone to open the door and taking advantage of the seconds you have to get a shot off.
It should require a bit more tactics, planning and luck to use your VERY effective high-powered sniper rifles to full effect in the busy mix.
We're looking into the possibility in coding in an exception to allow for flee to work on these doors since they realistically would open if you fled in their direction. Feng will need to look into that when he has some tonight or tomorrow or whenever he has it.
But for the time being you cannot flee through them, I suggest you try not to piss off other patrons, or maybe utilize disguise skill, and such. Yes, if you sneak, people will see the door open. So maybe time it on people going in and out.
More security comes with a cost of convenience.