Well I think we should keep things as it is to be honest, the warzone doesn't always create arguments. The 'What pisses you off' topic is good and I think the warzone should stay. Although we need to change some things.
The reason why not many people post in the 'GTAIV' section is because of the information we already have. I do admit I dont post there much because if theres a topic around and I want to add something new, I find that somebody already has said my point so I dont post there. I sort of roam the 'GTAIV' forum.
I cant really think of ways to encourage people posting in the 'GTA forums' without encouraging to spam to be honest. My idea would probably to freshen things up in the GTA forums, and maybe create a new forum (GTA Next) also some topics are just totally pointless in my opinion such as the 'GTAIV Wishlist topic', I think things need to change but not sure how.