Changing sitemap pagination page count to more than 100?

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How would I go about changing the max number of pages displayed in the Full Sitemap, to get around the issue described in this post:

https://www.concrete5.org/community/forums/customizing_c5/sorting-ma...

Before, the value could be changed via a variable in site.php, but the structure has changed drastically in 5.8

Rather than necro-ing the previous post, I figured I'd post a new one.