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PS

it-ogo, as an example, you may check this link: http://en.wikipedia.org/wiki/Southern_Russian_dialects

First,
It is not me who has invented that :) I am just citing the facts you may easily find in many articles on Russian dialectology.

Second,
I am not going to argue that 100% of southern...

Why?
Try to soften ш and you will get щ. Try to soften ж and you will get sound жь which is not used in Russian but still is pronouncible. Try to harden ч and you will get a sound like тш, which is...