Hey Codee,
That's a great idea - the Email Templates could definitely benefit from the Save & Copy button. Here's a patch you can add to saveAndCopy.php to enable it; on line 21 change this:
$addButton = isset($menuType) && ($menuType == 'multi' || $menuType == 'category') && ($action == 'add' || $action == 'edit');
To this:
$addButton = isset($menuType) && ($menuType == 'multi' || $menuType == 'category' || $tableName == '_email_templates') && ($action == 'add' || $action == 'edit');
Try it out and let me know if you have any issues!
Thanks,
Daniel
Technical Lead
interactivetools.com