Duplicate inventory command (exclusive for creative)

So you would type /duplicate_inventory @a,s,p,e,r and it would duplicate everything in your inventory and items that don't have a space fall on the ground. This would be very useful in map making or just getting items in general especially in Pocket Edition. Plz Mojang plz.

-Terraria8767YT                                                                                                                                                                        A Pocket Edition user