I agree this would be a really nice option to have in the Samsung Notes App. It works great in some of their other apps. In open notes vertical swiping is already used for scrolling. Pinch in and out is already used for zooming in and out. Swiping left and right isn't really used except when we're really zoomed in but I don't think that would matter if we're using a normal font size. All in all I think it would be a really good option.