That option is unavailable in CAW which is why I place lots in a save game after the world is done in CAW as is the case with Logan which is without lots on starting a new game though lots can be placed in edit town in a save file in custom worlds most of the time.Many great worlds have no lots or have empty lots to build on and those work great.
The only way around your issue would be to release a world that's blank without lots and place them in a save file.I'd warn others that the save might need certain EP's,SP's and Store Content to work though the world can be made to work with only the base game.Others have made populted saves to use with their worlds when they could't get it pre-populated for those who want populated towns.