Feature request - Some way to block incoming signals to a QObject

During development of Blackberry UI framework (Cascades) we have run in to situations where we would like to block all incoming signals to a QObject.

In the ListView control we have a cache for the list item objects so that when an item is scrolled off screen it is put into a cache instead of being
deleted. This is an optimization because creating objects is expensive so we gain speed by loading new list items from the cache instead of creating new objects.

The list item objects are created by the application developer in the app code.
So it is not possible to add blocking in the receiver object