Can't admin do this already? Non-admin can vote to add AI when there's only 1 person present and the vote is automatically passed. When there's more than one person it makes sense that a vote takes place, so if people don't want AI they have the opportunity to stop it happening. And if someone wants to be able to force it, log in as admin. I don't see what's wrong with this system, apart from possibly not being able to remove AI when you're by yourself (I haven't tested that).
