It gives too much eye strain to read long pdf documents on the default black on white colors. I am running a KDE application called kpdf through fink and it allows me to change the background color of a pdf, as DTP does for txt and rtf in full-screen. Is it possible to change pdf colors in DTP as well, or is it an Apple Webkit issue that Devon people can’t do anything?
A related request is to customize text and background colors in the main windows as well. As you can see I am not a fan of white backgrounds. 
Best,
pj