When you are at the middle or bottom of the page, the ability to reload it without entering the menu or having to return to the top and make a swipe down. You could make a swipe diagonally or laterally.
Chrome essentially lets you hold down the menu button to do it, as the reload button appears right over it. I think that's better than a new gesture that can confuse users.
@madiso See, i didn't know that. However, i would also prefer to have a gesture not to go on the menu.