Hello there!
A little suggestion regarding those systems we got 2 or more colonies, its very handy that its possible to trade around inner system reccourses to one planet and the others. But u cant do it like automaticly every turn..
If that would be possible, like with freighters that keep freight every turn, it would be a much more usable feature..
I think adding Trade Stations for every planet would be even more realistic, but that would be difficult with the trade routes and all I guess..
Kind Regards
Choleric