Why not add the ability to move items into limited slots using Shift+click?
It might not be the most popular idea, but I sometimes find myself missing this feature.
I thought that you can always add items into limited slots in the chest/wagon. If i understand it correctly, you mean adding a posibility to insert items through shift+click and ctrl+click into the limited slots?
Sorry i was really busy for past months. I will add this feature max somewhere in the next week.
And also i was looking on the mod you sent and i think it should be possible to detect shift-drag using cursor positions i am already using for even distribution module i wrote :D So it could be even feature on top of it for the wait (not promising anything okay XD)