Hello @jsilva
The Rotation property for pages is something that is specified by the PDF specification, which delineates it as follows:
Therefore, the API only supports rotations in intervals of 90 degrees to ensure cross-compatibility with other viewers.
Currently the SDK does not have support for de-skew. I did find another post that may offer some help in terms of optimizing your scans:
Best Regards,
Armando Bollain
Software Developer
PDFTron Systems, Inc.
www.pdftron.com