Yes, the last save is right after you skip the credits. I already knew this haha, IGT time stops at that save.
I would say just split at the last input like usual then wait for the cutscene to finish, the main reason of having ingame time splits is to not be affected by the loading time variation. Splitting precisely at the moment the game is saved would probably be too hard.
I can also look into making LiveSplit stop automatically when it is saved but I can't say for sure.
I can also look into making LiveSplit stop automatically when it is saved but I can't say for sure.