After having finished scaling, rotation and colour blending, i think it would be cool to add copy and paste in the rooms editor. I see two major benefits :
- As the instances will have new properties (scale, rotation,etc), it is useful when you want to copy exactly the same instance. No need to add a new instance and modify its properties
- When you will copy the instance, it will automatically set this instance as the new object type in the objects tab. This means that if you want to copy an object several times, you can copy it, and paste it if you need an instance with the same properties, or directly add it with the left button. In this way, you don't have to select the object time every time you want to copy or add new instances. By the way, as you can have a lot of objects, with many folders, it would be useful when you want to add new object to select the object with a window where all the objects are displayed in a graphical ways, but without folders. Think of file explorers where pictures folders are displayed with big icons. Of course it should be possible to select the 'old way' too.
Another benefit of copy and paste will appear when multi-selection when be added. But that's another story.
What do you think of my proposal ?