This doesn't help casual runners, but for speedrunners, this might be a lot, but requiring then to split for every star collected could make a far better star counter that would make it easier to verify for mods. However, as I stated before that would be annoying for a runner.
You can eventually add a counter on your stream/rec layout and increase it when you collect a Star. That's can be helpful for me sure. After require this... idk
The problem is when you complete a mission all stars collected respawn. So that's can be hell... However, You can collect all stars in one go before entering a Fortress and then beat the game. (But this is not optimal)
I hope MarioFanatic64 will add a counter for the next version or something. If not I think this category will be removed due to the difficulty to know if all stars have been collected.