scrollToYeah.js

// после scrollyeah.js
$(function () {
    // ↓ селектор активного блока
    $('.scrollyeah .one.active').each(function () {
        var $current = $(this);
        var $shaft = $current.parents('.scrollyeah__shaft');
        var $scrollyeah = $current.parents('.scrollyeah');

        if (!$current.length || !$shaft.length || !$scrollyeah.length) {
            return console.warn('Незачем крутить :-/');
        }

        var currentLeft = $current.position().left;
        var currentWidth = $current.outerWidth() + $current.css('margin-left').replace('px', '')*2;
        var shaftWidth = $shaft.outerWidth();
        var scrollyeahWidth = $scrollyeah.innerWidth();
        var shaftLeft = Math.min(0, Math.max(-shaftWidth + scrollyeahWidth, -currentLeft + scrollyeahWidth/2 - currentWidth/2));

        // аццкий хак, АПИ-то нет
        $shaft.css({left: shaftLeft}).trigger(jQuery.Event('mousedown', {which: 1, pageX: 0, targetTouches: [{pageX: 0, pageY: 0}]}));
        $(document).trigger('mouseup');
        $(window).trigger('resize');
    });
});