Add Post Office industry or something else that allows us to share/move items in storage between colonies. It's annoying when you start storing all your rare things in one of your colonies, then you always come back there, because that's where all the rare stuff is, and eventually it's a pain in the ass to move everything once you change the base of operations. It's even worse if you change it multiple times, as you find better locations. It doesn't have to be instantaneous, just make it possible to move items between your colonies without having to manually haul it from one place to the other.