P: "Skew" option in geometry

Simple as that. Time and time again I can get the geometry PERFECT except I need to skew the image slightly to make the horizontals and verticals 90 degrees. I can't think of any reason why this would be difficult or impossible, and I'm frankly supprised it's not already an option. Maybe there's a "skew Horizontal" and "Skew Vertical?" 

Alternately, you could just include a perspective warp tool in lightroom geometry, which I think would be even better.