1. Doesn't matter what the casus belli does, as my missed point was, YOU can get claims on other nations without YOU having any control over it, it happens both from events, and nation forming, and you cannot revoke those claims yourself.
2. The point is that someone fabricating a claim on you shouldn't be a free casus belli to start your own conquest on them, there's no justifiable arguement for starting a war other than insult, which already exists in the game, and gets granted for several event-triggered claims. And the risk of suffering aggressive expansion is a problem in a counter? That's what they had when they went through the trouble of making the claim, why should the other side get a conquest-based war out of it for free?
Another country considering a part of your country as their rightful property does not grant you the right to launch an invasion on them based on that, with the freedom to do any time from imidiately, to some 25 years in the future. That is why i say fabricating your own claims are counter-claims, not a counter as in something that stops it, but a counter as in somthing that you can do to them in return.
The ONLY thing i would consider something that could be justified, would be diplomatic insult, which in itself has a sensibly limited time duration as well, and is still more conquest-relaxed than i'd like it to be. I'd frankly prefer if all the "conflict" type of casus bellis either were restricted from freely taking land, or had an increased province warscore cost and aggressive expansion penalty on them. A casus belli not designed for conquest should not be lenient towards it.
Thanks for input!
1. The idea is that ANY claim (whether rightful, wrongful, forged, genuine, etc.) would result in this "Counter Conquest" CB.
2. Good points: CB's should be more restrictive in terms of peace offer types, so that more efforts and strategies are put towards producing the right CB in the game. Maybe this CB could have roughly the dame profile as Insult CB + Revoke Claim/Core if needed. Although I disagree that the natural reaction to another country having forged a claim SHOULD be forging you're own claim on them: the natural reaction SHOULD be to make them renounce that claim. I understand if the game mechanism currently makes that the natural reaction, but I think it SHOULDN'T be.