Ah I see there is a really old post of mine above .
Basically Browser -> on Back Button works and I think there is no way so that button wouldn't work. It works even with CocoonIO, which has limited browser functionality. You just have to export the game as Cordova project, not HTML5. Otherwise you will have to add manually the two lines I've mentioned a year ago.
Maybe post some screenshot? Which wrapper do you use? Do you export as Cordova?