Simming

Simming is often see as a bad thing in the grepolis forums. I also agree with them, but if used strategic simming can be really good for your alliance.

Strategy

You will only build defensive troops: DLU if you're not active or birs if you're active.
All your cities are DLU or birs cities. Then, you'll put all your production camps in the max level, because you can't farm.
Pros: You don't have to worry about attacking and timing attacks. You can support all your teammates and defend your cities at the same time.
Cons: You can be a target for the enemies. Most of your cultural points will come from City Festivals.