Grease Pencil - Duplicate Stroke(s) on Mirror command and mirror around 3D cursor

It would be useful if the Grease Pencil -> Mirror option window contained a checkbox to "duplicate stroke(s)" before applying the mirror. The mirrored strokes would then become the new selection.

Currently the strokes need to be duplicated manually (Grease Pencil->Duplicate or Shift D) and then the mirror command applied. A small thing I realize but removes the additional step.

Also, it would be very useful if there was an option to mirror around the 3D cursor similar to the modifier.