What you want. what you really want is this grasemonkey script
inline_blocker . it blockes all code that is run ofter onScroll. most of this code is just horrid java script to inform your masters you have fliped a page. also you can prevent onExit code from running. there is no reason you want java script to run when you leave a page.
java script timeouts can set in about:config
a search will show you how to change the d-pad behavior form scroll to page down
do i see a wiki page with browser tweeks evolving