Currently, the paging limit for categories is controlled by the $wgCategoryPagingLimit configuration parameter. This paging limit controls both the number of pages and files displayed in a category. Although listing 100 or 200 pages is acceptable, doing so for images may not be desirable.
Thus, it would be beneficial to have a configuration parameter for the maximum number of files listed in a category, e.g., $wgCategoryImageListingLimit or a similar setting.
In fact, there are 3 things displayed in a category:
Instead of a new variable, I suggest changing $wgCategoryPagingLimit to be an array, to allow a more fine-grained control:
$wgCategoryPagingLimit = [ 'pages' => 200, 'images' => 200, 'subcategories' => 200, ];
If defined as an integer in LocalSettings.php, it would mean using the same value for all 3 items.
Looks like I am not the only one linking this. Thanks for your feedback. Yeah, your suggestion for improvement is even better. I forgot about subpage listings.