When journey mode came out and i noticed the duplication system, i thought "Hey, why do they not have a creative mode like thing?" you can call it builder mode, you already have a bit of code made for it already, and that is the journey mode functions! but as a few added extras you can manipulate NPC happiness levels, Spawning NPC's and Enemies, it would be helpful for testing combos, Letting your creativity loose with EVERYTHING, or even just try out some more stuff!