Visitor should help with Firefighting

[SpaceDorf]

Because that is what guests do. I will describe Visitors and Traders as equal, Passerby's are different.

The most pressing design question behind this : it breaks suspension of disbeliev that they don't.
Visitors defend themselves against their enemies allready. They eat the colonies food sometimes, and I think no colony has ever denied medical care to a visitor that got wounded while defending the colony.
So when Visitors would respect the homezone and help out with fires it would go a long way in building a connection between the player and that faction.

For last, this effects Passerby's to. The pathfinding algorithm should treat fire differently than other obstacles because it is growing fast most of the times. It would be good if the path would try to find a minimum distance of 10 tiles or more to avoid burning areas, except when firefighting or ordered to get something from there.