Did you know, that in Tzunami Deployer, you can select multiple items and modify their metadata in one action?
Load the desired list into the Tzunami Deployer project, select multiple items (you can use the CTRL or SHIFT keys, just like in Windows Explorer). Once you have the items selected, right-click and select “Properties”.
You can now go and modify the values of the various properties. All the selected items will receive the assigned value.