Please add the command /merge (or name it as you like ). Similar to /block, the /merge command is applied on any type of spawner. If you have 9 stacks of spawners, you obtain 576 spawners in one single slot (same mechanic of the spawner control panel "Pickup Items"). So, with a full inventory you'll be able to get in a single slot 2304 spawners. Let me know what do you think, would you like to see this new command in game?