Add the option to assign planets to a core world

It would be great to have the option to assign a world to a specific core world like you can do with asteroids. At the moment you cant do that and theres no mod to enable the option, I was told on the discord server that its been asked for many times. But that I can reassign asteroids which does give you the same kind of flexibility. To be honest it doesnt. Lets say you want to add and develop a new core world, but you dont want one of your good core worlds to lose all the resources it gets. Atm theres no way to do it. I get that the devs did changed how things work to reduce micromanagement (I didnt like it at first but now I think it was a good change), however in some instances the lack of control is a problem that makes the game less fun (Im about to stop one game because i have a level 44 planet right between the capital world and the rest of the planets. I was hoping to get a mod to be able to turn the planet into a core world and not ruin the capital, but no luck with that.) I really hope the devs add this option for planets. Like a said this problem makes the game less fun. Needless to say that this is bad. I liked galciv (I, II,III and IV) so much that i never felt the need to mod any of the games until now. I just created an account here to provide this feedback. I hope the devs do read this things, otherwise this was just a waste of time.