I assume that you are referring Alice 3...
In the header for the addMouseClickOnObject Listener event, there is an "add detail" menu. One of the menu items in that menu is "multipleEventPolicy" from which you can select IGNORE. When you click on the object 10 times while the handler is executing, the extra clicks will be ignored.
If you have any other questions, let us know. We can be contacted at
don@alice.org