So, now we aren't just adding in TW style battles, we're rewriting huge tranches of the game to shoehorn them in.Then change it so that battles only last one day, and add a "synchronise arrival" option so that armies attacking from several provinces reach their destination at the same time. Problem solved, and much more realistic than the current set-up of having battles last three weeks.
We then have one day of fighting leading to the whole of a county being placed under siege...
Yes, but I don't see how that makes auto-resolving battles any harder.
Set all battles to auto-resolve when playing multi-player. Or, if there are only two players, manually fight the battles involving both players, and auto-resolve the rest.
So what's the point in adding the feature again? Especially if it now means that multiplayer and single player effectively become different games.