set the scroll distance for horizontal scrollview

My issue is about a horizontal scrollview which is scrolled then will scroll very fast, How could set a scroll distance limit so i could slowly to scroll.

my code:

var url_image = "images/image.png";
var array_images = [url_image, url_image, url_image, url_image, url_image, url_image, url_image, url_image, url_image, url_image, url_image];
var num_img = array_images.length;
 
var scroll = Titanium.UI.createScrollView({
    contentWidth : Ti.UI.SIZE,
    contentHeight : 80,
    height : 80,
    width : 320,
    top : 270,
    left : 0,
    scrollType : "horizontal",
    layout : 'horizontal',
    horizontalWrap : false,
});
 
for (var i = 0; i < num_img; i++) {
 
    var view_img = Ti.UI.createView({
        width : 146,
        height : 80,
        left : 8,
        right : 4,
        backgroundImage : array_images[i],
    });
    scroll.add(view_img);
}
win.add(scroll);