YGYL, the additional properties are already available for anybody who is ok to set [font=courier new]com.eteks.sweethome3d.additionalFurnitureProperties[/font] property or to program the plug-in that will prepare the list of properties. The use cases you explain are valid, but I'm not sure that this kind of users or their administrator will agree to prepare the list of properties on each computer where Sweet Home 3D is installed. An administrator will prefer to provide the right [font=courier new]SweetHome3D.l4j.ini[/font] file or install the right plug-in, this is less error prone, isn't it?

Maybe I wasn't clear enough. I'd like to be able to show the properties attached to an object in a list either in the Furniture Library Editor or in Sweet Home 3D, and to be able to change the values at any time.
In Sweet Home 3D, you can create a new column of properties at any time, and you can sort the whole thing by a particular column.
This would greatly expand the use of Sweet Home 3D!

For example, if you are looking for something, you can see where it is placed with a single mouse click in the item list. Sorting the list as a whole will show you what else is on top of the 2nd shelf of the shelf.

Without this feature, there would be no way to sort or even find it quickly and easily!