Retrieve all ratings (with or without a review) for an app on iTunes without max record limit for all countries

Having known and tried iTunes app store's customer reviews API (sample URL below), there are three problems that I need to solve:

1. The customer review rss feed URL returns only the records with customer reviews. How do we get the records with ratings alone which don't have any reviews in them?
2. The URL returns list of reviews for a given country. What should be done to retrieve the latest reviews across all countries?
3. CustomerReviews RSS page depth is limited to 10. So total of 500 latest records can be retrieved. How do we retrieve the history records?

Sample URL: https://itunes.apple.com/{country-code}/rss/customerreviews/page=1/id={app-id}/sortby=mostrecent/json?urlDesc=/customerreviews/id={app-id}/sortby=mostrecent/json

Any hint or solution is much appreciated.