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The short answer to your question is that you can't. Kobo changed the way that it does full book page numbering in kepub, and there is no support for the old way in the recent firmware. If you really want that option, you need to downgrade the firmware.
As to the option in the extended driver, no, it doesn't do anything with the current firmware. But, it does with older firmware. And it wasn't strictly needed for a lot longer as it was added when Kobo added a hidden option for full book page numbering in kepubs which was a while before they added the option in the settings. But, the driver is compatible with all versions of the firmware. While this option doesn't do anything for current firmware, it also doesn't break anything, so there is no real reason to remove it. But, updating the tooltip might be a good idea.
And for the record, there is absolutely nothing on that page that is not well discussed in this forum. And it isn't a popular one to mention here as the tools they sell use the open source DRM removal tools with no credit given.
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