Hey, sis, I saw this in the
PRS customizer thread
* Volume key page turns allows you to page forward and back through text by pressing either the + or - volume key. Don't choose this option if you use your Reader to play digital music!
** Circle pad history allows you to page forward and back through Reader History by pressing either the > or < key on the left bottom circle pad. Don't choose this 0 ption if you use your circle pad for regular page turns!
Would this be something? There is a page forward only one also.