Here's a explanation of Inventory Tweaks: Press R and it auto organizes your inventory, and it can organize chests with 3 buttons at the top. I think it would probably be more helpful on Survival though xD But I'm going with Creative.
My in-game name: xKittyYT_x
My suggestion for the server and/or forum: For the server, inventory tweaks mod
For which gamemode is this suggestion: Creative
Description of suggestion: Basically inventory tweaks is allowed on creative