@hansmex
I'm glad You find it useful too.
@2-When You drag&drop a furniture on the plan and immediately right click to modify it You will don't find the Modify furniture menu; is the way how SH3D work; the furniture are registered when You deselect it by clicking somewhere in plan.
This plug-in work with clipboard NOT with selected items.
You have to copy (Ctrl+C)+deselect and than You could use Paste(Ctrl+V) or Paste special...
@Rotate -I have this in my mind but I don't verify if it could be applied to ALL kinds of items (especially for walls).
Maybe another tool something like Distribute angle ?????