Instead of a mote, this should be an auto result of eating and drinking. Now granted we don't need to eat or drink now. but in the future,when we do, having a beer will result in an inadvertent burp or having food give you gas, so you stink up the joint every once In a while. Life is like that , when we try to fart with out the help of certain foods we usually end up blasting a brown rug burn in our tighty whities. We should have that ability here, but rather like life, what ever pleasures you take on, you deal with their consequences. Heck, I would love to see one day characters gain weight, like that Xbox game Fable. Imagine a fat Cat or a lumpy Smurf wobbling towards you. But for now i would setting with a fart after eating a pie or two, mind you not under my control just a random and hidden countdown to the explosion.
Towards that end, I think Farts should have a detrimental effect on those around ground zero, including the bombardier. There should be a temporary stat loss and and even frequent falls(rest) till the DMZ is is reached, at which time the victims instantly recover. Entering such a hot zone should be given a warning of the stench and their characters automatically yelling out loud the equivalent of "EeeeWwuuU POOPY!", "Someone light a MATCH!!", "What crawled up you ARSE and died!?!", etc. Like the ambient sound, there should be a chorus of flatulence in the sounds score, to give those around a warning of the invisible stalker emanating from the guy that just took off running. Except for the Silent but Deadlys, but that's a given.
I mean really, if we give control to the player and make it a simple text blurb, it looses all meaning and just results as more spam to be ignored. But take out of the players control, a random event and give them the decent BAD vibs they merit and you got a memorable and fascinating aspect of the game.
But this is as far as I would take it, working outhouses is not something I would like to see in the game.