Cool Illustration Andybot!
So everyone can understand what we are after!
Professionnal in architectural photo field always utilize such tool (In french it is called "un objectif à décentrement") It keeps the perspective height (usualy human eye) keep all the subject in the photo and vertical lines stay "vertical".
That is exactly what you do in sketchup when you activate "two point perspective". When it is on you can pan the image whitout loosing the perspective point of View.
It is a crucial tool in Archviz.
Take a look at Thea or Maxwell. the use ot this tool is absolutly obvious...In VFSU it is much less IMO!
but andybot approach does work
A