As the title says, Planning Mode. That may be a bit problematic but the idea is, that you it (presumably) stops time and lets you design your base without any cost and time, just *puff* and it is there. After designing the place you just click "Make-It-Happen- button and your bots go to work and build the place. No idea how would redesigning work, probably there would be a counter of how many resources would it take otherwise there could be a situation where everything is done exept... I don't know the food farms and your colony starves to death.
If you like this idea probably you would like those too:
Priority AI : www.ape-apps.com/viewpage.php?p=9885
Parking Spot / Tool : https://www.ape-apps.com/viewpage.php?p=9878
i think it is in the game but you can't chose and i more/less stupide