my solution to prevent swipe:
Code:
MyCarousel = Ext.extend(Ext.Carousel, {
    ...
    afterRender: function() {
        MyCarousel.superclass.afterRender.call(this);
        this.mon(this.el,{
            touchstart: function(ev) {
                var t = ev.getTarget('.noscroll-class');
                if (t) {
                    this.preventScroll = true;
                } else {
                    this.preventScroll = false;
                }
            },
            scope: this
        }
    },
    onScroll: function(e) {
        if (this.preventScroll) return;
        MyCarousel.superclass.onScroll.call(this,e);
    },
    onScrollEnd: function(e, t) {
        if (this.preventScroll) return;
        MyCarousel.superclass.onScrollEnd.call(this,e,t);
    }
    ...
});