Actually, if you did the opposite, and made cities no killing/robbing and only the wild is "robbing and the such" then you could have a more centralized roleplay experience.

For example, people would now need a "safe way" to go from Moscow to St.Petersburg, making a new job, taxi drivers..

Also people may want to scavenge,. but want safety in numbers, so they would hire someone to guard them while they go into the wild..

I really don't know which is better I just thought that could be interesting

Both really good suggestions actually. However I wouldn't want to over complicate the rules and stuff making certain locations KOS zones- its hard enough getting people to just not KOS in general lol.

I love the idea of either having to stay away from cities to avoid the risk of being killed in a survivor RP scenario. 

And on the other hand making the wild a danger zone forcing people to have to be smart and sneaky when going from town to town. Both of these would add a little spook into the servers. If any changes like these happen to come about in the future,  I'd probably do a voting poll on what the community would prefer more: cities as KOS/robbery zone, or wilderness as KOS/robbery zones

Ahm... I think u may have misunderstood. I suggest that only one KOS area in a map.  E.G. the only KOS area in Russia is Petersburg OR Moscow. Or maybe you can make a war game area in forest on each server too!