How about an option to station a colonist somewhere as a sentry? A patrol path or whatever. In the colonists schedule he would patrol during the 'work' hours. It would need another column in the job list (fire fighting, growing, hauling, patrolling). It would save a little bit of micromanaging - if a raid appears at least one capable colonist wont be caught napping. The trade off is that less work in the colony would be done.
If it needed to be developed a little you could have a soldier role, where military colonists sleep in barracks, train, watch prisoners etc. They presumably wouldn't mind sharing a room and they could grab equipment off equipment racks in an armoury.
If it needed to be developed a little you could have a soldier role, where military colonists sleep in barracks, train, watch prisoners etc. They presumably wouldn't mind sharing a room and they could grab equipment off equipment racks in an armoury.