suspendEvents/resumeEvents for ST 2 (will be part of 2.2.0 b1).

gistfile1.js

Ext.define('Override.mixin.Observable', {
    override : 'Ext.mixin.Observable',

    eventFiringSuspended : false,

    doFireEvent : function (eventName, args, action, connectedController) {
        var me = this,
            ret = true,
            eventQueue;

        if (me.eventFiringSuspended) {
            eventQueue = me.eventQueue;
            if (!eventQueue) {
                me.eventQueue = eventQueue = [];
            }
            eventQueue.push([eventName, args, action, connectedController]);
        } else {
            ret = me.getEventDispatcher().dispatchEvent(me.observableType, me.getObservableId(), eventName, args, action, connectedController);
        }

        return ret;
    },

    /**
     * Suspends the firing of all events.
     *
     * All events will be queued but you can discard the queued events by passing true in
     * the {@link #resumeEvents} call
     */
    suspendEvents : function () {
        this.eventFiringSuspended = true;
    },

    /**
     * Resumes firing events (see {@link #suspendEvents}).
     *
     * @param {Boolean} discardQueuedEvents Pass as true to discard any queued events.
     */
    resumeEvents : function (discardQueuedEvents) {
        var me = this,
            eventQueue = me.eventQueue || [],
            i, ln;

        //resume the events
        me.eventFiringSuspended = false;

        //don't loop over the queue if specified to discard the queue
        if (!discardQueuedEvents) {
            for (i = 0, ln = eventQueue.length; i < ln; i++) {
                me.doFireEvent.apply(me, eventQueue[i]);
            }
        }

        //clear the queue
        me.eventQueue = [];
    }
});