The ability to group objects + basic chapes or structural items, or just plain groups of basic shapes, so when people create custom furniture or modify premade ones, they can save them to what could be a section called smth like "My Models" or "Your Models", but before this you would be able to select which basic shapes or scructural parts you would want to group together for the colour mode, this would be scripted possibly by using click detectors and putting the items in groups that would be the different colour swatches. The way it would look would be the items you have selected to group into an object would be highlighted in (example)blue, you would then have the option to add colour groups with a gui starting with 1 colour group and a plus button, whenever you select a colour group you can then click the parts you want to be apart of it and they will be highlighted red, then when you go to a new colour group, all of the parts you have not selected become blue and the parts you already have in a colour group would be not highlighted. To unselect it you would just click it again. Once you make your item colourable, you can name it, and then you can use it across multiple lots.