Hello
Yes, and one can do that in several ways.
One way can be by exporting the culprit pages as images - per example tif non compressed format.
Than correct the image in an image editor like Photoshop - a free and very lightweight alternative is Pain.NET (
http://www.getpaint.net).
Import the edited pages back into finereader, and re-ocr all the images (or if you have ocred all the other pages ocr just the imported ones).
Another way can be not to scan directly with finereder (this I think is what you are doing, right?), but to numbered image files with the scanner own application - probably you will get better success rate this way.
Than, if one or more pages are not straight, use an image editor to correct them.
Import all the images into finereader and ocr them away.
Best regards,