I have some questions about your plugin :
Thank you in advance for your answer.
Thank you for your interest in our plugin.
As for grouping columns, and expanding on-click - you can enable Responsiveness feature, and select the columns you wish to hide on tablets. Then, go to main settings of wpDataTables and increase the tablet width to a greater value (for instance 2000px). When you do this, all screens under 2000px in width will be considered tablets, so columns will be hidden under the first column, and will be available on click. You can take a look at our documentation, and see how it works.
wpDataTables: FAQ | Facebook | Twitter | Front-end and back-end demo | Docs
Amelia: FAQ | Facebook | Twitter | Amelia demo sites | Docs
You can try wpDataTables add-ons before purchase on these sandbox sites:
Powerful Filters | Gravity Forms Integration for wpDataTables | Formidable Forms Integration for wpDataTables