The idea for this mod is very simple. It allows players to have multiple functions key bound to the same key. Since there are so many mods that have many different key commands, they often overlap other mods when they are put together in a modpack. The overlapping key bound commands usually don't function, or if they do, they are only doing one function and you have to reassign the other functions to a different key. The way I see this mod working is having actions/commands bound to the same key will pop up a window/GUI that will allow you to pick the action you want to use, either by clicking the action/command or by hitting the number that the command/action is bound to. Naturally, this means that there can only be up to nine (maybe ten if you count 0) commands/actions that can be bound to the same key at the same time. In the configuration of the keys, you would add the number to the command/action you want to take up that spot (i.e. Jump = J1, Place Block = J2, etc. or for a modded example, Cast Spell = J1, Sit Position = J2, Crawl Position = J3, etc.), but all you really have to do is type J to open the GUI menu.