I’ve got custom action editing working in the zone editor now.  Here’s an example:

To create an action, you select items from the drop down list to build a sentence describing the trigger and the resulting action.

After you have an trigger added, you can add additional actions by selecting the item in the list and clicking “add subaction”.  You can see examples of this in the screenshot.

There are also “find” buttons that help you locate the various items you can use as arguments.  Even though you can just type values into the text boxes, this can be handy when you want to make sure you have the right item or have gotten the spelling right on the spell to cast.

This will be available for mobs and objects in the next release of the zone editor.