Currently the only way to manipulate the undo queue is to run a script with doScript and even then it's very limiting. With my current event listeners, the user clicks around a few times and the undo queue fills up with 'Undo Set Scripting Tag' and they are unable to undo simple changes without holding down CTRL+Z for a few seconds. I am unable to use doScript because I need to return values to my interface. I would like to suggest an option to temporarily suspend undo tracking during certain script actions. Some of my actions do not change the document and only update the interface.