What this would do is give us 5 boxes of tools in a tool belt. So when crafting instead of right clicking the items into the craft window, it would act as a toolbelt. You load up the tool belt with the tools you use. Like say Hammer and Chisel. Now you can do any craft you want without having to right click the tools into the crafting window, because it uses the tool belt window instead.
This would help when doing different crafts but that use the same tools often.
It can even be used in say like fishing, or hunting actions. You load up a toolbelt and it pulls from the belt to use the action instead of having to swap out your weapon after every animal kill.