I'm not keen on fires mostly because
they appear to last forever.
They should use fuel.
They should have a chance to be put ont in rain (particularly if low on fuel).
Finally, in stronger winds or when many are placed in the same vicinity there should be a chance to start a forest fire and destroy all the neighbouring land and encampment.
Just go into a forest, make 40 fires and then leave them to go hunting.
I'll all for sandbox, but these extent of these fires at the moment is hardly realistic.