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I agree with the campfire and the outside lights part. it's really important to have a cooking method that does not require electricity.
I agree with the roughing it mentality...though the base game has yet to offer some type of fuel to burn..ie woods ect. I suppose you could try to burn plants..but there goes the food.
Well, from what I've seen, raiders burn quite well.
mwahahaha.. tru dat.

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anyways, more cheap ideas :
-undrafted colonists, seem to have no sense of danger. they should have an AI that tells them to interrupt their current task and tell them to run away from enemies upon visual contact. (maybe tell them to gather to the nearest dining table.
-drafted colonists should have an AI that tells them to automatically seek the nearest cover available when their cover is destroyed or when they are caught standing on open ground.
-colonists should stop shooting when friendlies are caught in the crossfire. same thing when using thrown weapons. friendly fire needs to look more like an accident rather than deliberately ignoring friendlies in your line of sight even after emptying several bullet clips .