Actually I'm not assuming anything, there is no scripting involved truthfully, that was just me being lazy and writing script, it actually involves adding a rule to a conversation which checks the speaker for an item equipped in the head slot, which branches the conversation off in another direction and abruptly ends it. There is no need too break immersion by making PC's spam remove your hood! because most conversations (if not all) in the module are private the staff don't have a habbit of creating conversations that spam everyone present, and you wouldn't add it to generic PC's who don't have a store or a meaningful conversation.
This idea isn't silly, actually its rather good, its the Neverwinter Nights equivalent of walking into a Liquor Store wearing full motor cycle leathers and a helmet with the visor down, its just not right in society, its rude, its potentially dangerous and people will react badly too it. NPC's don't have to appear to be unemotional robots, they can appear to react to the world around them, and the players who converse with them, I cannot see this any reason to label this mechanic to be a negative thing.
I am going to try and touch on few responses here:
You have swayed my opinion, it is not silly, let me get my orthopedic inserts on, because I stand corrected. Joking aside.
Look, I see your point, it is the law of the land, but that being said it is IC law, and such laws can change. You want NPC's to appear to be unemotional robots, well giving them a generic response that they repeat over and over would do exactly the opposite of what you want.
I've seen plenty of players that go out of their way to make a casual banter with a NPC's, when a dm sees that, they are even more likely to jump in and posses the NPC and continue with the rp because they know that there is a player who creates rp out of nothing.
Further more, yes I understand that there are some players that are not going to learn, but when I see that I realize that I am just trying to teach them something using the wrong approach. In some cases those players need to die a time or three before they start getting the bigger picture. There is approach to teach everyone, you just have to put some thought and effort in it, do it in an inventive way.
On one distant server long time ago, there was an IC law/rule to keep the fort gates closed at all times, and yet they were still left open, people ignored it due to whatever reasons they had, and then one player decided to make a gate greeter PC. All he did was stand at the gates and greet people, opening and closing the gates for them. Tremendous amounts of rp was created from it, and people were coming to chit chat with him while he was "working as a gate greeter". Enough time passed and people picked up on "Hey, let's start closing the gates when we leave the fort!".
There is a drive thru liquor store here that let's you get your booze and you don't even have to leave the car, or hop of your motorcycle.
As one of my old professor would say: This is a very good drawing, very very good, but I think it is for the best that we don't let anyone else in the class see it. Then he crumpled my drawing and tossed it into the garbage bin.
Since it is a fantasy setting, I thought I'd bring this up.
[youtube=425,350]http://www.youtube.com/watch?v=gvO35MunzU0[/youtube]