The black border *is* exported in SVG export mode. Just import my furniture library, put couple of symbols and export to SVG.

If I use rotate indicator - the pictogram remains in its original form and not rotated. I guess this also explains why autorotation (when the symbol "sticks" to the wall near it) does not work. I think the problem is in the way the symbols are described in PluginFurnitureCatalog.properties.