I had an idea for traits, what if you are able to determine one colonist as a leader, and his traits will have positive and negative effects on the whole colony?
For example you can have a leader who is a veteran and gives a boost to shooting for the whole colony however he is lazy and gives a negative buff and everyone requires more sleep than usual. Or a leader who has a trait in mining and improves everyones mining, but is psychotic and makes people more prone to being afraid.
I dont know how well this will work with the current lists of traits, mainly cause there are so many which cant be used for this system, but I think it'll lead to some interesting gameplay. We can possibly find someone whose traits matches our play style and we'll do everything we can to protect him. It will also ensure that every colony will behave differently than the last. It'll also give possibility for raids or assassination attempts that focus on just killing or kidnapping our leader.