Since version 1.6.5 of the plugin it’s possible to group entries with the same data in one entry.
For example, you want to build a map of USA and a few states will have the exact same information. Instead of adding one entry for each state, you can group them with the same data, inserting the region code with this format:
US Group Example
This is valid for grouping countries or subcontinents also.
It will not work in Coordinates mode, and the preview of the map won’t display the groups. This is still a feature in development.