Auto-stack or auto-sort? Auto-stack sounds like a bad idea. The Q of items can be very important, and combining different Q's has a very harsh rounding down. Auto-sort is a different matter though, especially given the positioning of items within an inventory window (for warehouse, chest, whatever) is client based in order to save server resources. This means one persons careful sorting of a crowded inventory is meaningless to everyone else who accesses that inventory, and has been a problem from day one. An auto-sort (e.g, line everything in the inventory in columns and rows based on name and quality) makes a lot of sense.