Using mousemove to create regions to trigger a scroll.

mouseMoveScroll.js

_setupEvents: function() {
    this.$el.on( "click", "a.detail-content-trigger", this.openYear );
    this.$el.on( "mousemove", _.throttle(this._checkMouse, 500));
},
_checkMouse: function( event ) {
    var winWidth = $( window ).width(),
        // Define some regions of the screen to toggle left and right scrolling.
        screenRegions = {
            Left: "0 300",
            Middle: "300 " + (winWidth - 300),
            Right: (winWidth - 300) + " " + winWidth
        },
        // Get the active mouse position.
        mouseX = event.clientX,
        high, low, region;
    
    region = _.reduce(screenRegions, function(memo, region, name) {
        low = region.split(" ")[0];
        high = region.split(" ")[1];
        if ( mouseX > low && mouseX < high ) {
            memo = name;
        }
        return memo;
    }, "");

    if ( region ) {
        this[ "scroll" + region]();
    }
},
scrollLeft: function() {
    console.log("Scroll left");
},
scrollRight: function() {
    console.log("Scroll right");
},
scrollMiddle: function() {
    console.log("Scroll middle");
},