Well, maybe you should get a temporary
bonus.
Probably yes, but, really, only if all those "Stop the war" will be restricted to senate only.
Because, you see, war is very important element of this mod, a lot of different units with a lot of promotion and different use. Even average city, even on marathon speed, able to produce 1unit a turn, and with multiple production sometimes few units.
Everything is made for a good war, not really understand why war should be restricted at all, honestly.
If you are really going to introduce this change into mod, maybe then it should be something without serious consequence?
Average event of average significance, something like:
1. Agree to stop the war (well, maybe if agree then it generate temporal happiness or something like this).
2. Disagree (generates unhappiness, but not many, maybe 1? ;D, and without additional demands from senate to stop the war in a future).
3. Bribe. Grade importance of the event to zero.
Something without significant impact on game.
But if you will ask me personally, I don't see a reason why it should be in game at all.
Besides, what if your friendly-good-relations-no bad-actions-brother on faith neighbor has more military than you do and running Imperium?