When manually unloading the inventory screen, items are constantly moving, so if I try unload my extra iron ore with shift + click then at the last second it moves and I accidentally unload my spare crusher and it's wasted. There is no way to sort or have items not move around.

I tried installing mods from the ingame menu because I heard it was easier. It asks me for a login, but it doesn't give me an option to make one. Do i need the login from steam?