There are many text traversal action defined for Narrator.

Here are some
CP+Y jump text start (already implemented)
CP+B jump text end (already implemented)
CP+] read from cursor
CP+h readdocument
CP+[ next character, CP+shift+[ previous character, CP+control+[ current character
CP+p next word, CP+shift+p previous word, CP+control+p current word
CP+o next line, CP+shift+o previous line, CP+control+o current line
CP+i next paragraph, CP+shift+i previous paragraph, CP+control+i current paragraph
CP+u next page, CP+shift+u previous page, CP+control+u current page