Yes, in CB: Featured Pages Grid widget you can only set 8 pages and to increase the no of pages requires a higher code customization since we have to register and unregister the class and manage other codes.
So as much as we would love to help you with this we are unable to do so as this is beyond the support we offer for our product.
So our suggestion to you is hire a proffesional developer so that your theme wont be affecte in any way.
To hire a developer please follow below given link:
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