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?

JonnyD, lLarger icons would imply higher rows, so a less usable editor and I don't think that increasing the size of the image shown in the popup would be so helpful since the displayed image is already at its full size i.e. 128x128 pixels.