Vanilla +

Sit anywhere you want! Look down, double tap sneak and right click and you sit. As easy as that. Or you can just sit on stair/slab or via "/trigger sit". Work on vanilla servers, or any other setup.

The “don't move mister horse” feature you're looking for.

A Fabric mod to allow for easy input and output into and out of inventories without needing to open their inventories.

Get your chests/hoppers/... back by putting minecart and boat variants into a crafting grid to get all uncombined items! (ex: 1 minecart AND 1 chest)