I am not sure the computer plays well enough even with 200 pop to be a real asset to the team. How do you call for help or trib? Or how does it ask for same? Its tactics are predictable, so it is easy to counter. However, as a spoiler in a game, they are great! Since it attacks (maybe poorly) in tool, it makes an all-out tool attack silly. You have to keep troops behind to counter the computer, even if the rest of your opponents don't attack. We always round out the field with computers allied together. As for the 200 pop, you have to edit all the AI and PERs, not an easy undertaking, and they will not play correctly at *any* other pop limit. Not to say you can't do it, but its a lot of work!
Keep your stick on the ice.