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I believe this module was developed by Hervet, so I doubt if any incrementing value data type will be incorrect (e.g. accidentally using TINYINT which would stop at record 127, or 255).
You should be able to mix InnoDB and MyISAM tables in the same application, but InnoDB support needs to be enabled on the server.
Your host seems to think it is, but you can check yourself:
* Open phpMyAdmin.
* Click on the 'Storage Engines' link on the main screen.
* If InnoDB is enabled it will be highlighted in blue.
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