Symmetry without screwing up UV's

[Ran13]

orbiter...
Wings' existing Virtual Mirror does that already, but takes it one step further... it does so across any arbitrary plane, not just a global axis.

et al...
Having had all sorts of nightmarish problems with "Symmetry" in Silo, having to revert back to the old style mirror method closely resembling Wings, I don't have a lot of faith in such systems, especially when the plane of symmetry is not a global axis. Blender's (global axis-based) symmetrical modeling/sculpting works pretty well these days, though, so I guess it's possible if you don't need an arbitrary symmetry plane.

Not to mention that you guys make it sound like the 2 or 3 mouse-clicks and a half dozen or so key presses it takes to get from whole mesh to VM to whole mesh takes hours and not seconds.

That said, I don't have a horse in the race as I seldom edit UV mapped meshes in Wings. My meshes start in Wings, get perhaps a elementary stab at UV mapping, then the "heavy lifting" is done elsewhere.