At the moment the button and the flick do the same but for some reason the button takes longer to load history than flick gesture (weird). with four in history the button takes a 1sec black screen the flick doesnt, so whatever is the difference dont touch the flick! having the button assigned as "back one page" is the best idea for closed keyboard as you dont have a button for it but two possibilities to go to history.... sounds weird and it is!