Which some people like(d) to use in games such as aoe and c&c. a certain time before you are allowed to attack. in this case the option a certain amount of turns option before you are allowed to attack a player/ai. local countries being free to capture still ofcourse.

i dont think thats necessary since conq is turn based compared to games like aoe or c&c. meaning you have enough time to think about your moves, offensive or defensive. you will hardly have enemy contact before round 5 in teamgames and if you play ffa that i would say is part of the game. you can still change difficulty settings...

I know this rule from Starcraft. I played it competitive in tournaments for some years and it worked well just on verbal base without any support by the game itself. I think thats how we should test it before investing energy into it.