When on the versions page, there should be a way to add or edit multiple versions at the same time.
When you click on the versions tab from the setting pages, you will still be presented with the list of versions.
Once you choose the versions you want to edit, the normal editing box will appear, but multiple times (See attached file).
This will not only work for editing but for adding multiple versions as well.
By implementing this idea you will be creating a better workflow for end users, which in turn makes them happy :D