I need the Mirror Features tool! I took the Cartography. MOOC and recently attended the Migrating to Pro live-instructor class in Vienna, VA. Both gave me access to Pro (since I do not have it on my machine yet). I looked and looked for this tool, but could not find it anywhere.
My use case: Field collecting and developing existing Neighborhood site plans. This 2-second mirroring operation saves hours of time over the life of a project such as this.
To add this tool in Desktop was simple - add the Editor toolbar --> Rt click as if to add another toolbar --> scroll down to the bottom to Customize --> Open Commands tab --> Search by "Mirror" --> Choose the Editor version (the icon with two triangles separated by a line and an arrow from one triangle to the other). Drag the icon to the Editor toolbar. Voila! Now mirroring a polygon, line work or a group of points is as simple as selecting the objects and drawing a 'flip line'. The selected items appear on the other side of the flip line. PLEASE bring this into Pro!