Sorry I missed this one! Was this for me??
So your beef with CivIV is that you can't exploit and backstab at your own will? Huh...
I'll answer you question. Let me try n explain....
When talking intruders in CIv3 Well, if the AI Civ's gots a strong army and they have to pass through you in order to reach that objective, they will do it. Its up to you to say "Halt! put up your dukes!" or cower in the corner and let them pass cuz you know they will stomp your ass if confronted
If there intention is to stomp someone else, as long as you don't get in there way (try to turf) they will leave you alone.Thats the brakes in real life man. If their small, kick their puny ass out. If they declare war its cuz their tough enough not to be pushed around so you better recognize who your dealing with first. Also ,You should be following them to see what the fuss is about! Its a great time to join sides and join their march to advance your borders or, mybe to prevent these guys from growing any bigger you join his intended target to fight them off. Ether way, a solder dosn't march around aimless so you take a hint man. If its a worker, by all means let him build roads for you! thats real to. Americans are in my country taking my construction jobs all the time but when I see them flossing their tanks up and down the great white North I get worried, you dig?
In CIv4 you could cage a powerful civ by not signing open borders with him (no unit may enter without declaring war automatic)IN other words, If your in the middle and he wants to take out a civ for a resource it needs on the other side of you, you can block him from it!! Yes and later when you've built up enough forces, take whatever you seperated from him for yourself!.
-MEGA EXPLIOT!For some reason even though he may be big enough to plow you down, as long as your the same religeon and have some trade going, hes content to be held at bay on your demand. Believe me CIv4 is far from perfect as well. The fact a civ has to declare war with you, his friend and place to ditch his extras resources on, just to reach another country to crush for a resource he's in desprate need of for is way worse then the facts of life you complain is a expliot. Think about it, by the time he fights you off he can't even complete his original objective
So I guess its the brown nosing in insignifigant areas that can snub out the drive for war against you in justified areas (resource blocking)are what need to be adressed come new X pak- Cool! ended on topic!