Dear Mr. Imran,
Thank you for your thoughtful suggestion.
We have used the method you proposed from initiation of the sheet up until June 2012 where, as you have suggested, there was indeed a Column D which mentioned the Region of the editor's contribution. However, the column was discarded since July 2012. I was not involved with the forum back then, so I cannot reply why the column was discarded, but my guess would be that expert reviewers didn't need a regional column anymore since they reviewed all sorts of features throughout the country, the attributes and naming conventions across the country are mostly the same.
The new Map Maker interface introduced a way to subscribe to changes within a neighborhood of your preference, you can learn more about it
here. If you are particularly interested in reviewing edits from a neighborhood of your choosing, this should is what you should do. On doing so, click on a neighborhood after subscription via
Show changes in My Neighborhoods and select
In Review on the left. You can subscribe to any political region, be it a sub-locality, locality, city or a country.
Hope this helps.
Kind Regards.
P.S: You linked to our Review History spreadsheet, not the Review Request Spreadsheet.