Cynic said:
something like this would be possible using the "release puppet" command. and i'm quite sure this would be possible with a patch. making a puppet=dissent hit, releasing this puppet = less dissent. but additionally, when releasing a puppet, this puppet should not be at war with anyone. and in no alliance.
but the main problem is, that puppets are too powerful, getting all the tech of the puppet master when created. so if a puppet, will not join the masters alliance automatically, and get less tech, then it would be much better balanced then the dissent hit.