I was hoping to use QU to do something that I can't see how.
1.)
I'm playing with panorama pictures from 4 or more photos stitched together. If I use 'fit to page' or 'fit to paper' it fits the height and fills the paper but only has a fraction of the width included. I was trying to get the program to do the work of fitting in the maximum width possible on a horizontal page, the height would take care of itself.
2.)
Of course the maximum width available would be along the diagonal, the panorama would need to rotate about 40 degrees anti-clockwise for that. If the panorama height varies that make an interesting problem.

I can do it with trial and error and calculator in photoshop but can anyone see a short cut or two?
   The hours we spend!
                                      John
 

John,
Me again, I didn't read your query properly  as I got carried away with ICE
Turn off Auto Crop and use fit to page.
Terry

Hi John,
Yes, that's easy too: rotate the image in the editor. See screen shots below, editor rotated 30deg and page preview. I got the angle by trial and error but you could calculate it. The image used was just a cropped version of one in a recent folder.
Again, fit to page with auto crop off was used.
Terry

EDIT:
The new measuring tool in the page  editor enables you to check how much advantage there is in using the rotated image.
In the one shown the overall length increased by 20mm (~3/4") on A3+ paper. That's only 4% - is it worth it? Using a non-rotated image I could get 3 prints on the one page!