If a character is on fire, what they would they roll to put themselves out? How long should this take? A spot fire versus being completely engulfed might require different amounts of effort and difficulty.
For reference, Savage Worlds Deluxe has a pretty straightforward section on catching on fire and that fire getting worse.
Anytime something flammable is hit by fire, roll 1d6. On a 6, the target catches fire. Very flammable targets, such as a scarecrow, catch fire on a 4-6. Volatile targets, such as a person soaked in gasoline, catch fire on anything but a 1. Each round after a victim catches fire (at the beginning of his action), roll as if checking to see if the victim catches fire again. If he does, the fire grows in intensity and does the damage listed above each round.
My initial idea was just taking an action to try an Agility roll, maybe with a bonus for "stop drop and roll" and the like.