Found another small bug.
Can't set Per page for Category Item Reviews on detailed page of the Item (Front-end). Keep getting 404 since Category Item Prefix is not passed along with main and sub-item (review) prefixes in Redirect parameters.
In case if you want to test - note that pagination is available in Advanced theme on Item (ie. Link) detailed page when you have at least 1 Review created.
Here is a task + Patch ready for testing.
916: Can't set Per page for Category Item Reviews