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Mexico and Italy were some of the first maps we made available...before we standardized on using HASC codes for the country maps. We never did go back and change it because people had been using them for some time already. We will add that to our list of considerations going forward.
We will review the countries you note as not having good subdivisions, and make updates as needed.
NOTE: we will still accept requests to commission custom country maps if you cannot wait. Contact email@example.com for a quote.
UPDATE: Updated maps for Italy and Mexico using standard HASC values for the country code will be released in early August 2010. The other countries that need to be updated will be available by the end of August.