I would be great to be able to adjust an image by individual angle when indexing instead of just left or right full 90 or 180 degrees that it is now. Some of my images would do great with just a couple small tweaks of the image angle and totally doesn't work with how much the image rotates now. This gives me an uncomfortable index position instead of the document reading straight up and down.
There's a mathematical reason for this limitation. Images are made up of masses of solid-color square pixels. Rows of square pixels can be rotated 90 degrees without any change to the pixels. But, if you rotate square pixels fractionally, say 10 degrees, you end up image degradation (zig-zag effects or missing pixels). Editing software usually blurs lines when rotating fractionally so that the degredation effect is less noticable to the human eye. This blurring is almost unnoticable on high resolutuion images (because the pixels are so small), but can be quite noticeable on low resolution photos, or photos with sharp, strait lines.0