-the main scroll speed is in paf.prx ,. just use prx editor(install CTFtoolGui5beta) and you can double click the prx files,.. you will find scrollspeed-up/down and scroll-speed left/right this is for the basic scrolling,.. for submenu scrolling you have to edit msvideo_plugin.prx replace all 200 to 800 but there is some speed left see next,..

-the scroll speed out of sub-menu's isn't in prx editor,..:
if you r using hex workshop,. just open vshmain.prx and search for "200" 32bit float you should find 2 entry's ;) i am not sure but 1 is the scroll speed you need for scrolling out of sub-menu's

when using hex-workshop you will edit a clean prx file,.. prx-editor will scramble out the scrambled offsets for you to edit,. these offsets were protected by sony,. most were scrambled but 1 or 2 are not,.. eg the 200scrollspeed in vshmain.prx and in music_player.prx there is also a 200 value for scroll speed that wasn't scrambled.

anyway the main scroll speeds are in paf.prx and you can edit them by installing CTFtoolGui and double clicking the paf.prx,.