yes, i was asked before same your question and someone answer me jailbreaking ps3 will make it Region free. So all you just to do is downgrade your ps3 to rogero 3.55 then QAFlag then your lover CFW. i prefer kmeaw CFW, and now your jp ps3 is region free.
to change execute button just install PKG that called Rogero button changer 3.55 give try Enjoy!!