I showed the book to my group on the weekend. After going through the rules, an interesting joke came up: "what if you're on fire?" This was expanded upon to include being splashed with acid, or bitten by a cobra. Essentially, what about things that will continue to worsen until you deal with it?
My solution was that in these situations you will continue to accrue one stress per turn until receive treatment (extinguish the fire, neutralize the acid, suck out the poison) and convert it to a trauma. To prevent this from killing you outright in less than nine turns, we agreed that resistance would slow the progression (one resistance slows it to one stress every two turns, and so on).
What do you guys think? Feel free to post any other homebrew ideas or house rules here as well.