Inventory OCD kills me sometimes. I keep my hotbar filled at all times with my essentials, and I stuff everything else I get in /chests. Chest 1 is for valuables, chest 2 is for cheap stuff you get in bulk such as cobble and dirt, and chest 3 is for other. You can sort through that stuff when you arrive home to your organized chest system.
This is not going to be accepted and nothing like it will be. Auto inventory movement is used in many pvp hacks, and it can give players a very unfair advantage. An example would be automatically equipping armor in your inventory.
Not going to +/- 1 because it is not going to happen. Sorry.