1. If You post hire the png, we will see what You want to say.
2. If I understood correctly You want to change the representation in plan of doors or windows which is other thing then a 2D Symbols library.
3. Almost everything is possible; You must know what is the final.
4. For what I suppose You want You must learn and try to modify the property of door or window in PluginFurnitureCatalog.properties file on doorOrWindowSashxxxx options.
5. Show us what You want and somebody in this world will try to help You.