First, I'd ask what you want, not which feature you want to added and how.
It's different from making zones (let's say, a 100) which then are used by individuals who claim them as their (as somebody mentions, some fights tend to last weeks), which renders others - to say the least - uninvited if they use it for their own purposes.
So, you basically want, what I get:
- to have longer lasting personal fight RP areas
- who are saved for a long time (content expiration also affects zones as they are chats)
Correct me if I am wrong.
PS:
I don't think adding a huge number of zones or making personal zones last very very long be a good answer.
You can alwas throw more resources at something, but the problem's solution might lie elsewhere.