My only gripe with this otherwise sweet plugin is that disabling it has no effect. This is common with plugins (including some that I've written), but I thought it might be good if it could be toggled on and off. In my latest project, I accomplish this with the following override:
Code:
Ext.define('Ext.plugin.PullRefreshToggleable',{
    override:'Ext.plugin.PullRefresh',
    
    //Hide/show the visual component based on if the plugin is disabled/enabled
    setDisabled:function(isHidden){
        this.setHidden(isHidden);
        this.callParent(arguments);
    },
    
    //Only let handlers do their thing if the plugin is enabled
    onScrollChange:function(){
        if(!this.isDisabled()){
            this.callParent(arguments);
        }
    },
    onBounceTop:function(){
        if(!this.isDisabled()){
            this.callParent(arguments);
        }
    },
    onScrollerDragEnd:function(){
        if(!this.isDisabled()){
            this.callParent(arguments);
        }
    }
});
This way, a developer can use plugin.setDisabled() as you might expect. plugin.disable() and plugin.enable() should work too, but I haven't tested that. If people like it, maybe someone could add it to the *official* code?