None of the proposed cities will get production so they will only be rail hubs and a place for reinforcements.
1. Ryazan: About 525.000 inhabitants:
http://en.wikipedia.org/wiki/Ryazan
This city will help the south-east flank of Moscow once Tula falls
2. Vladimir: About 345.000 inhabitants:
http://en.wikipedia.org/wiki/Vladimir
This city will help getting reinforcements to the Moscow area if Moscow is under attack.
3. Lipetsk: About 500.000 inhabitants:
http://en.wikipedia.org/wiki/Lipetsk
This city will help setting up a defense line along the Don north of Voronezh. The area seems rather empty now.
4. Saransk: About 300.000 inhabitants:
http://en.wikipedia.org/wiki/Saransk
This city will help setting up a defense line east of Ryazan once Ryazan falls. The area seems rather empty now.
5. Izhevsk: About 630.000 inhabitants
http://en.wikipedia.org/wiki/Izhevsk
This city is quite large and will help building up a defense line once Kazan falls.
6. Makhachkala: About 575.000 inhabitants:
http://en.wikipedia.org/wiki/Makhachkala
This city will help setting up a line at the Caucasus and it can be used as a port as well. That possibility can be used by both sides. This was an ancient fortress city and is the capital of Dagestan.
7. Uralsk: About 350.000 inhabitants
http://en.wikipedia.org/wiki/Oral,_Kazakhstan
This city will help sending units to the area east of Stalingrad
8. Sterlitamak: About 275.000 inhabitants
http://en.wikipedia.org/wiki/Sterlitamak
This city will also help forming a line once the Germans get across the Volga. Magnitogorsk won't help because of many rough hexes towards the front line.
9. Syktyvkar: About 235.000 inhabitants
http://en.wikipedia.org/wiki/Syktyvkar
Fills a city in the far north where it should be possible to send units
10. Nizhny Tagil: About 360.000 inhabitants
http://en.wikipedia.org/wiki/Nizhny_Tagil
Helps defending just in front of Omsk.
The changes look like this.



