When you try to add CUSTOM gestures on Mac, "Zoom in" and "Zoom out" are not available, but on windows it is available, because the reason for example is, yes i can use the preset gesture for zoom in and zoom out, but i do not want the other features which is "rotate" and "smart zoom" i only want zoom in and zoom out feature hence i would like to add "custom gestures", but when you go custom the zoom in and out only gesture is not there for Mac only!