yes, you can add the Populate list from array behavior to the body unload event.
first you will need to create the URL Variable bindings. on the bindings panel, click the plus button, select URL Variable and name the bindings.
The in the Dreamweaver tag selector, select the Body tag and then add the Populate list from array behavior. you will also want to use the Set Selected in list behavior to use the URL Variable bindings to set the list selected value.