
We’re looking for a feature that will allow end users to add or subtract certain columns from the table. For example, we have a dataset with 37 countries and want users to be able to compare just two or three countries side-by-side on a dozen or more measures. This could function via a checkbox- or multi-selector-type tool.

Hello Colby,
If we understood you correctly, this option already exists. You can try it on our Sandbox:
https://sandbox.powerful.wpdatatables.com/
If you need more help, please contact our support, and they will gladly assist you.
If we misunderstood your suggestion, feel free to provide more details, and we will reconsider creating it in the future.
Thank you for your time.