I like this plugin. It's simple and effective.
I wonder if you would be open to a feature suggestion?
Currently, when in the Users section of the Admin Panel, the information can be sorted by, Username, Name and Email. What do you think about adding the ability to sort by the ID, your "WP Show IDs" plugin displays? Maybe a way to choose which data is used, as the default, for sorting, could be included with your plugin as well.
Just a thought.