Comment 3 for bug 387495

I assume the point is that they want to have mirroring but still run each display at their native resolution.

The clipping on the smaller monitor would likely be quite confusing, although perhaps if panning is utilized the setup would be usable.

In any case, I think the use case for this configuration would need to be made more convincingly before adding it to the GUI config tool. We wouldn't want to clutter up the dialog with stuff that few people need and risk adding complexity and confusion.