From: My Own Private Hell
Not modding but a couple of useful tips
Assign Lorros, Zenebattia and Korriban spice when you find them to the number keys, the moment that the window pops up to say that a special resource has been found, pause the game, go to the location, click on the planet to select it and assign that planet a hotkey with CTRL+ a top row number, I use 0,9 and 8. This means that even if the planet is colonized and disappears on the resource sort on the expansion planner or the galactic map you can still find them and make plans to get them into your empire.
If like me you really dislike the haphazard way bases are strewn around a colony, starbase, research station, defense base etc, then select the colony, pause the game and move the mouse pointer where you want your new base, now press the right hand button and select the build at option, where ever the mouse was when you selected it will be where the new base is placed, much easier for building defenses in a logical manner.