I teach logsitics using factorio. As often as possible I publish tasks and solutions in my blog or on youtube, most in German sorry.
So I look for mods making nonsensical behavior realistic so that students can't take advantage of it.
Belt overflow is helpful, because a belt that keeps running just throws everything on the floor. I have learned that another idea
https://www.reddit.com/r/factorio/comments/pjrxfi/request_for_a_special_belt_mod/ is not so good. So Belt-Overflow is ok.
But any belt needs electricity, so I use https://mods.factorio.com/mod/PoweredBelts too.
Additionally I use spawn belts https://mods.factorio.com/mod/spawn-belt to create material from nothing,
sometimes it is good to be able to rescue students from hopeless situations.
But unfortunately it does not work together, very sad.
Perhaps ist´s possible to make this combination work.
Also a combination-mod overflow and powered belts would be great.
I crosspost this in powered belts too, maybe something will come of it.