Forcing peace with Makedon as Koinon Hellenon just seems completely WRONG to me. Maybe another faction is a better choice for you?

Most people use Forced Diplomacy to help out the AI because the Diplomacy system is completely retarded. Such as forcing peace with a nation after defeating them for the most part. Or many times, they use Force Diplomacy to hlep out nations that need it such as Pontus or anyone else getting overrun way too soon.

If you really must, and you do enjoy it, then go ahead by all means and don't let me stop you =]